**JONATHAN MACHTA**

Department of Physics

University of Massachusetts Amherst

Tel: 413-545-0654

Fax: 413-545-1691

E-mail: machta@physics.umass.edu

**Education**

B.S., Mathematics

University of Michigan, Ann Arbor, MI 1975

M.S., Physics

University of Illinois, Urbana, IL 1976

Ph.D., Physics

Massachusetts Institute of Technology 1980

**Professional Experience**

** **

Postdoctoral Research Associate

Institute for Physical Science and Technology

University of Maryland, College Park, MD 1980-82

Assistant Professor

Department of Physics and Astronomy

University of Massachusetts, Amherst, MA 1982-87

Associate Professor

Department of Physics and Astronomy

University of Massachusetts, Amherst, MA 1987-92

Visiting Scientist Institute for Physical Science and Technology

University of Maryland, College Park, MD 1989

Michael Visiting Professor

Department of Physics of Complex Systems

Weizmann Institute of Science, Rehovot, ISRAEL 1997

Full Professor

Department of Physics

University of Massachusetts, Amherst, MA 1992-

Department Head

Department of Physics

University of Massachusetts, Amherst, MA 2002-2007

Visiting Scientist

Department of Physics

New York University, New York, NY 2005

External Professor

Santa Fe Institute, Santa Fe, NM 2007-2013

**Editorial Boards**

Journal of Statistical Physics 1997-1999

Divisional Associate Editor, Physical Review Letters 2007-

**Research Interests**

Theoretical and computational statistical mechanics and condensed matter physics; phase transitions,disordered systems, complex and nonequilibrium systems, computational complexity, spin glasses, random and self-avoiding walks, granular gases, superfluidity.

**Publications**

1. "Light Scattering and Pair Correlation Functions in Fluids with
Nonuniform Velocity Fields," J. Machta, I. Oppenheim, and I.
Procaccia, Phys. Rev. Lett. **42**, 1368(1979).

2. "Statistical Mechanics of Stationary States. VI. Hydrodynamic
Fluctuations Theory Far From Equilibrium," D. Ronis, I. Procaccia, J.
Machta, Phys. Rev. A**22**, 714 (1980).

3. "Statistical Mechanics of Stationary States. V. Fluctuations in
Systems with Shear Flow," J. Machta, I. Oppenheim, and I. Procaccia,
Phys. Rev. A**22**, 2809 (1980).

4. "Fluctuations in Steady State Systems," I. Oppenheim and J.
Machta in *ScatteringTechniques Applied to Supramolecular and
Nonequilibrium Systems *(Proc. of NATO ADV. STUDY INST., Plenum,
1981), Eds. S.H. Chen, B. Chu, and R. Nossal.

5. "Generalized Diffusion Coefficient in One-Dimensional Random
Walks with Static Disorder," J. Machta, Phys. Rev. B**24**, 5260
(1981).

6. "Mode Coupling Theory of Hydrodynamics and Steady State
Systems," J. Machta and I. Oppenheim, Physica **112**A, 361
(1982).

7. "Diffusion in a Periodic Lorentz Gas," J. Machta and R.
Zwanzig, Phys. Rev. Lett. **50**, 1959 (1983).

8. "Renormalization Group Approach to Random Walks on Disordered
Lattices," J. Machta, J. Stat. Phys. **30**, 305 (1983).

9. "Power Law Decay of Correlations in a Billiard Problem," J.
Machta, J. Stat. Phys. **32**, 555 (1983).

10. "Long Time Tails in Stationary Random Media. I. Theory," M.H.
Ernst, J. Machta, J.R. Dorfman, and H. van Beijeren, J. Stat. Phys.
**34**, 477 (1984).

11. "Long Time Tails in Stationary Random Media. II. Applications
to Lorentz Gases and Hopping Models," J. Machta, M.H. Ernst, H. van
Beijeren, and J.R. Dorfman, J. Stat. Phys. **35**, 413 (1984).

12. "Current Noise and Long Time Tails in Biased Disordered Random
Walks," W. Lehr, J. Machta, and M. Nelkin, J. Stat. Phys. **36**,
15 (1984).

13. "Localization of Third Sound by a Disordered Substrate," S.M.
Cohen and J. Machta, Phys. Rev. Lett. **54**, 2242
(1985).

14. "1/f Noise in a Hopping Model with Trapping," J. Machta, M.
Nelkin, Th. M Nieuwenhuizen, and M.H. Ernst, Phys. Rev. B**31**,
7636 (1985).

15. "Random Walks on Site Disordered Lattices", J. Machta, J.
Phys. A, Math. Gen. **18**, L531 (1985).

16. "Diffusion and Long Time Tails in the Overlapping Lorentz
Gas", J. Machta and S.M. Moore, Phys. Rev. A**32**, 3164
(1985).

17. "Anomalous Long Time Tails Due to Trapping", J. Machta, J.
Stat. Phys. **42**, 941 (1986).

18. "Decay of Correlations in the Regular Lorentz Gas", J. Machta
and B. Reinhold, J. Stat. Phys. **42**, 949 (1986).

19. "Hydrodynamic Modes of Superfluid Helium Adsorbed on
Nuclepore", S.M. Cohen, R.A. Guyer, and J. Machta, Phys. Rev.
B**33**, 4664 (1986).

20. "Conductivity in Percolation Networks with Broad Distributions
of Resistances", J. Machta, R.A. Guyer, and S.M. Moore, Phys. Rev.
B**33**, 4818 (1986).

21. "Third Sound and Capillary Condensation on a Fractal Surface",
S.M. Cohen, R.A. Guyer, and J. Machta, Phys. Rev. B**34**, 6522
(1986).

22. "Crossover in the Anderson Transition: Acoustic Localization
with a Flow", S.M. Cohen, J. Machta, T.R. Kirkpatrick, and C.A.
Condat, Phys. Rev. Lett. **58**, 785 (1987).

23. "Largest Current in a Random Resistor Network", J. Machta and
R.A. Guyer, Phys. Rev. B**36**, 2142 (1987).

24. "Comment on the Conductivity Exponent in Continuum
Percolation", J. Machta, Phys. Rev. B**37**, 7892 (1988).

25. "Superfluid Films in Porous Media", J. Machta and R.A. Guyer,
Phys. Rev. Lett.** 60**, 2054 (1988).

26. "Superfluid Films on a Cylindrical Surface", J. Machta and
R.A. Guyer, J. Low Temp. Phys. **74**, 231 (1989).

27. "Polymers in a Disordered Environment", J. Machta and R.A.
Guyer, J. Phys. A**22**, 2539 (1989).

28. "Static and Dynamic Properties of Polymers in Random Media",
J. Machta, Phys. Rev. A**40** (Rapid Communication), 1720
(1989).

29. "Large Currents in Random Resistor Networks", S-K Chan, J.
Machta and R. A. Guyer, Phys. Rev. B**39**, 9236-9239 (1989).

30. "The Superfluid Transition in Porous Media", J. Machta and
R.A. Guyer, in *Quantum Fluids and Solids*, p. 161-169, eds. G.
G. Ihas and Y. Takano (AIP Conf. Proc. no. 194, 1989).

31. "Finite Size Effects in Continuum Percolation", A.-M.S.
Tremblay and J. Machta, Phys. Rev. B**40**, 5131 (1989).

32. "Annealed Versus Quenched Diffusion Coefficient in Random
Media", P. Le Doussal and J. Machta, Phys. Rev. B**40 **(Rapid
Communication), 9427 (1989).

33. "Comment on 'Exact solution for diffusion in a random
potential' ", R. A. Guyer and J. Machta, Phys. Rev. Lett.** 64**
(Comment), 494 (1990).

34. "Self-avoiding Walks and Manifolds in Random Environments", J.
Machta and T. R. Kirkpatrick, Phys. Rev. A**41**, 5345 (1990).

35. "Phase Transitions in Fractal Porous Media", J. Machta, Phys.
Rev. Lett. **66**, 169 (1991).

36. "Self-Avoiding Walks in Quenched Random Environments", P. Le
Doussal and J. Machta, J. Stat. Phys. **64**, 541 (1991).

37. "Differential Migdal-Kadanoff Renormalization Group for
Disordered Systems", J. Machta and M. S. Cao, J. Phys. A **25**,
529 (1992).

38. "The Computational Complexity of the Self-Avoiding Walk on
Random Lattices", J. Machta, J. Phys. A **25**, 521 (1992).

39. "Exact Enumeration of Self-Avoiding Walks on Lattices with
Random Site Energies", I. Smailer, J. Machta and S. Redner, Phys.
Rev. E**47**, 262 (1993).

40. "The Computational Complexity of Pattern Formation", J.
Machta, J. Stat. Phys. **70**, 949 (1993).

41. "Self-Organized Criticality in 4He with a Heat Current", J. Machta, D. Candela and R. B. Hallock, Phys. Rev. E**47**, 4581 (1993).

42. "Migdal-Kadanoff Study of the Random-Field Ising Model", M. S.
Cao and J. Machta, Phys. Rev. B**48**, 3177 (1993).

43. "Phase Diagram and Correlation Length Bounds for Mandelbrot
Aerogels", J. T. Chayes, L. Chayes and J. Machta, J. Phys.
A**26**, 4249 (1993).

44. "Large Tensions in Random Elastic Networks", S. K. Chan and J.
Machta, Phys. Rev. B**49**, 120 (1994).

45. "On the Parallel Complexity of Growth Models", J. Machta and
R. Greenlaw, J. Stat. Phys. **77**, 755 (1994).

46. "On the Behavior of the Surface Tension for Spin Systems in a
Correlated Porous Medium", L. Chayes and J. Machta, J. Stat. Phys.
**79**, 117 (1994).

47. "The Parallel Complexity of Algorithms for Pattern Formation
Models", R. Greenlaw and J. Machta, in *Canada/France Conference on
Parallel Computing*, Montreal, Canada, May 1994. Lecture Notes in
Computer Science, volume 805, Springer-Verlag, editors M. Cosnard, A.
Ferreira, and J. Peters, pages 23-34.

48. "The Parallel Complexity of Eden Growth, Solid-on-Solid Growth
and Ballistic Deposition", R. Greenlaw and J. Machta, in *Second
European Symposium on Algorithms*, Utrecht, The Netherlands,
September 1994. Lecture Notes in Computer Science, volume 855,
Springer-Verlag, editor J. van Leeuwen, pages 436-447.

49. "Distribution of Large Currents in Finite-size Random Resistor
Networks", P. M. Duxbury, R. A. Guyer and J. Machta, Phys. Rev.
B**51**, 6711 (1995).

50. "Invaded Cluster Algorithm for Equilibrium Critical Points",
J. Machta, Y. S. Choi, A. Lucke, T. Schweizer and L. V. Chayes, Phys.
Rev. Lett. **75**, 2792 (1995).

51. "The Computational Complexity of Generating Random Fractals",
J. Machta and R. Greenlaw, J. Stat. Phys. **82**, 1299 (1996).

52. "The Parallel Complexity of Randomized Fractals", in
*Parallel Algorithms for Irregularly Structured Problems,* Santa
Barbara, USA, August 1996. Springer. Editors A. Ferreira et. al.,
pages 351-356.

53. "Invaded Cluster Algorithm for Potts Models", J. Machta, Y. S.
Choi, A. Lucke, T. Schweizer and L. V. Chayes, Phys. Rev. E**54**,
1332 (1996).

54. "Parallel computational complexity and logical depth in
statistical physics", Jonathan Machta and Raymond Greenlaw, in T.
Toffoli, M. Biafore and J. Leao (ed.), *PhysComp96*, New England
Complex Systems Institute (1996), 201-207.

55. "The Computational Complexity of the Lorentz Lattice Gas", K.
Moriarty and J. Machta, J. Stat. Phys. **87**, 1245 (1997).

56. "Graphical Representations and Cluster Algorithms, Part I", L.
Chayes and J. Machta, Physica A**239**, 542 (1997).

57. "Parallel algorithm and dynamic exponent for diffusion-limited
aggregation", K. Moriarty, J. Machta and R. Greenlaw, Phys. Rev.
E**55**, 6211 (1997).

58. "Monte Carlo study of the Widom-Rowlinson fluid using cluster
methods", Gregory Johnson, Harvey Gould, J. Machta and L. K. Chayes,
Phys. Rev. Lett. **79**, 2612-2615 (1997).

59."Graphical Representations and Cluster Algorithms, Part II", L.
Chayes and J. Machta, Physica A**254**, 477-516 (1998)

60."Graphical Representations and Cluster Algorithms for Critical
Points with Fields", O. Redner, J. Machta and L. F. Chayes, Phys.
Rev. E**58**, 2749-2752 (1998).

61."Graphical Representations for Ising Systems in External
Fields", L. Chayes, J. Machta and O. Redner, J. Stat. Phys.
**93**, 17-32 (1998).

62."Invaded Cluster Algorithm for Equilibrium Critical Points", J. Machta, Y. Choi and L. F. Chayes, in, Computer Simulation Studies in Condensed-Matter Physics XI, D. P. Landau and H.-B Schuttler editors, Springer, 1999.

63."Parallel Invaded Cluster Algorithm for the Ising Model", Y. S.
Choi, J. Machta, P. Tamayo and L. X. Chayes, Int. J. Mod. Phys. C
**10**, 1-16 (1999).

64."The Mean Field Theory for Percolation Models of the Ising
Type", L. Chayes, A. Coniglio, J. Machta and K. Shtengel, J. Stat.
Phys. **94**, 53-66 (1999).

65."Dynamic and Static Properties of the Invaded Cluster
Algorithm", K. Moriarty, J. Machta and L. Y. Chayes, Phys. Rev.
E**59**, 1425-1434 (1999).

66."Cluster Methods for Ising System with Fields", J. Machta, Int.
J. Mod. Phys. C **10**, 1427-1432 (1999).

67."Entropy, Information, and Computation", J. Machta, Am. J.
Phys. **67**, 1074-1077 (1999).

68."Internal Diffusion-Limited Aggregation: Parallel Algorithms
and Complexity", C. Moore and J. Machta, J. Stat. Phys. **99**,
661-690 (2000).

69."Cluster Monte Carlo Study of Multi-component Fluids of the
Stillinger-Helfand and Widom-Rowlinson Type", Rongfeng Sun, Harvey
Gould, J. Machta and L. W. Chayes, Phys. Rev. E**62**, 2226-2232
(2000).

70." Cluster Monte Carlo Simulations of Phase Transitions and
Critical Phenomena in Zeolites", Ilija Dukovski, Jonathan Machta,
Chandra Saravanan and Scott Auerbach, J. Chem. Phys. **113**,
3697-3703 (2000).

71. "Replica Exchange Algorithm and Results for the Random Field
Ising Model", J. Machta, M. E. J. Newman and L. Chayes, Phys. Rev.
E**62**, 8782-8789 (2000).

72. "Critical Dynamics of Two-Replica Cluster Algorithms", X. -N.
Li and J. Machta, Int. J. Mod. Phys. C**12**, 257-271 (2001).

73. "Parallel Dynamics and Computational Complexity of the
Bak-Sneppen Model", J. Machta and X.-N.Li, Physica A**300**,
245-270 (2001).

74. "Invaded Cluster Simulations of the XY Model in Two and Three
Dimensions", I. Dukovski, J. Machta and L. Chayes, Phys. Rev.
E**65**, 026702 (2002).

75. "Sampling Chaotic Trajectories Quickly in Parallel", J. Machta, (nlin.CD/0202056) and J. Stat. Phys. **109**, 863-873 (2002).

76. "Ground State Numerical Study of the Three-Dimensional Random Field Ising Model", I. Dukovski and J. Machta. (cond-mat/0207438) and Phys. Rev. B**67**, 014413 (2003).

77. "What is the Best Way to Simulate an Equilibrium Classical Spin Model?", J. Machta and L. E. Chayes, in *The Monte Carlo Method in the Physical Science: Celebrating the 50th Anniversary of the Metropolis Algorithm, *pp. 232-239, ed. J. Gubernatis, AIP (2003).

78. Review of *Equilibrium Statistical Mechanics* by Gene Mazenko in Am. J. Phys. **71**, 733-734 (2003).

79. "Structural and Computational Depth of Diffusion-Limited Aggregation", D. Tillberg and J. Machta, Phys. Rev. E**69**, 051403 (2004).

80. "Parallel Dynamics and Computational Complexity of Network Growth Models", B. Machta and J. Machta, Phys. Rev. E**71**, 026704 (2005) and cond-mat/0408372.

81. "Stationary States and Energy Cascades in Inelastic Gases", E. Ben-Naim and J. Machta, Phys. Rev. Lett. **94**, 138001 (2005) and cond-mat/0411743.

82. "Understanding the Temperature and the Chemical Potential through Computer Simulations'', J. Tobochnik, H. Gould and J. Machta, Am. J. Phys. **73**, 708-716 (2005).

83. "Overcoming the Slowing Down of Flat-Histogram Monte Carlo Simulations: Cluster Updates and Optimized Broad-Histogram Ensembles", Y. Wu, M. Körner, L. Colonna-Romano, S. Trebst, H. Gould, J. Machta and M. Troyer, Phys. Rev. E**72**, 046704 (2005) and cond-mat/0412076.

84. "Ground States and Thermal States of the Random Field Ising Model", Y. Wu and J. Machta, Phys. Rev. Lett. **95**, 137208 (2005) and cond-mat/0501619,

85. "Power-law Velocity Distributions in Granular Gases", E. Ben-Naim, B. Machta, and J. Machta, Phys. Rev. E**72**,021302 (2005) and cond-mat/0504187.

86. "High Precision Measurement of the Thermal Exponent for the Three-dimensional XY Universality Class", E. Burovski, J. Machta, N. Prokof'ev and B. Svistunov, Phys. Rev. B**74**, 132502 (2006) and cond-mat/0507352.

87."Complexity, Parallel Computation and Statistical Physics", J. Machta, Complexity Journal, **11** (5), 46-64 (2006) and cond-mat/0510809.

88. "Numerical Study of the Random Field Ising Model at Zero and Positive Temperature", Y. Wu and J. Machta, Phys. Rev. B**74**, 064418 (2006) and cond-mat/0602314.

89. "Dynamic critical behavior of the Chayes-Machta-Swendsen-Wang algorithm", Y. Deng, T. M. Garoni, J. Machta, G. Ossola, M. Polin and A. D. Sokal, Phys. Rev. Lett. **99**, 055701 (2007), 4 pages and arXiv:0705.2751.

90. "The Percolation Signature of the Spin Glass Transition", J. Machta, C. M. Newman and D. L. Stein, J. Stat. Phys. **130**, 113-128 (2008) and arXiv:0707.0073.

91. "Percolation in the Sherrington-Kirkpatrick Spin Glass," J. Machta, C. M. Newman and D. L. Stein,for Brazilian School in Probability no. 10. In Birkhauser Progress in Probability Series, Vol. 60, (2008) and arXiv:0710.1399.

92. “Ginzburg-Landau Polynomials and the Asymptotic Behavior of the Magnetization Near Critical and Tricritical Points,” R. Ellis, J. Machta and P. Otto, J. Stat. Phys. **133**, 101-129 (2008) and arXiv:0803.0178

93. "A Percolation-Theoretic Approach to Spin Glass Phase Transitions," J. Machta, C. M. Newman and D. L. Stein, 2007 Paris Summer School "Spin Glasses.", arXiv:0805.0794

94. "Strengths and Weaknesses of Parallel Tempering," J. Machta, Phys. Rev. E**80**, 056706 (2009), 7 pages and arXiv:0908.0012.

95. "Comment on 'Finite-Size Berezinskii-Kosterlitz-Thouless Transition at Grain Boundaries in Solid 4He and the Role of 3He Impurities'," B. Yucesoy, J. Machta, N. Prokof’ev, and B. Svistunov, Phys. Rev. Lett. **104**, 049601 (2010).

96. "Asymptotic Behavior of the Finite-Size Magnetization as a Function of the Speed of Approach to Criticality", R. S. Ellis, P. T. Otto and J. Machta, Annals of Applied Probability **20**, 2118-2161(2010).

97. "Population annealing with weighted averages: A Monte Carlo method for rough free-energy", J. Machta, Phys. Rev. E **82**, 026704 (2010),7 pages.

98. "Granular gases under extreme driving", W. Kang, J. Machta and E. Ben-Naim, Europhysics Lett. **91**, 34002 (2010), 6 pages

99. "Parallel Complexity of Random Boolean Circuits". J. Machta, S. DeDeo, S. Mertens, C. Moore, J. Statistical Mechanics: Theory and Experiment, P04015 (2011), 18 pages.

100. "Monte Carlo Methods for Rough Free Energy Landscapes: Population Annealing and Parallel Tempering", J. Machta and R. S. Ellis, J. Stat. Phys. **144**, 541-553 (2011).

101. "Natural Complexity, Computational Complexity and Depth", J. Machta, Chaos **21**, 03711 (2011), 8 pages.

102. "Packing squares in a torus," D. W. Blair, C. Santangelo and J. Machta, J. Statistical Mechanics: Theory and Experiment, P01018 (2012), 14 pages.

103. "Computational study of a multistep height model," M. Drake, J. Machta, Y. J. Deng, A. Douglas, and C. Newman, Phys. Rev. **E85**, 061104 (2012), 9 pages.

104. "Evidence of Non-Mean-Field-Like Low-Temperature Behavior in the Edwards-Anderson Spin-Glass Model," B. Yucesoy, H. G. Katzgraber, and J. Machta, Phys. Rev. Lett. **109**, 177204 (2012), 5 pages.

105. "Correlations between the Dynamics of Parallel Tempering and the Free-Energy Landscape in Spin Glasses," B. Yucesoy, H. G. Katzgraber, and J. Machta, Phys. Rev. **E87**, 012104 (2013), 9 pages.

**Invited Talks**

1. "Renormalization Group Approach to Random Walks on Disordered Lattices", Symposium on Random Walks, National Bureau of Standards, 5/28/82.

2. "Random Walks on Disordered Lattices", Harvard University, Condensed Matter Seminar, 10/14/82.

3. "Random Walks on Disordered Lattices", Cornell University, Chemical Physics Seminar, 11/30/82.

4. "Random Walks on Disordered Lattices", Physics Colloquium, Clark University, 2/11/83.

5. "Localization of Two Dimensional Classical Waves", University of Massachusetts, Condensed Matter Seminar, 11/20/84.

6. "Localization of Two Dimensional Classical Waves", Institute for Theoretical Physics, University of Utrecht, Netherlands, 11/11/85.

7. "Localization of Two Dimensional Classical Waves", KFF of KFA, Julich, West Germany, 1/16/85.

8. "Hydrodynamics on a Disordered Substrate", MIT, Theoretical Chemistry Seminar, 4/8/85.

9. "Localization of Classical Waves in Disordered Systems", Solid State Seminar, Brown, 1/23/86.

10. "Anderson Localization of Classical Waves", Solid State Seminar, Northeastern, 1/30/86.

11. "Percolation with a Broad Distribution of Bond Strengths", Invited Poster, STATPHYS 16, Boston University, 8/11/86.

12. "Anderson Localization of Classical Waves", Physics Colloquium, Wesleyan University, 10/30/86.

13. "Anderson Localization of Classical Waves", Physics Seminar, Schlumberger-Doll Research, 3/3/87.

14. "Acoustic Localization with Broken Time Reversal Symmetry", March APS Meeting, 3/20/87.

15. "Superfluid Films in Porous Media", Condensed Matter Seminar, Yale University, 9/30/87.

16. "Anderson Localization of Classical Waves", Physics Colloquium, University of Missouri, Rolla, 10/8/87.

17. "Superfluid Films in Porous Media", Condensed Matter Seminar, Clarkson University, 10/30/87.

18. "Superfluid Films in Porous Media", Condensed Matter Theory Seminar, Harvard University, 11/19/87.

19. "Superfluid Films in Porous Media", Solid State Seminar, Cornell University, 2/16/88.

20. "Superfluid Films in Porous Media", Condensed Matter Seminar, Princeton University, 4/19/88.

21. "The Statistical Mechanics of Vortices", Applied Mathematics Seminar, University of Massachusetts, 5/3/88.

22. "Anderson Localization of Classical Waves", Physics Colloquium, Syracuse University, 11/10/88.

23. "Localization of the Sound Modes of Helium in Porous Media and Symmetry Breaking by a Flow", SIAM Workshop on Random Media and Composites, Leesburg VA, 12/10/88

24. "Statics and Dynamics of Polymers in Porous Media", Condensed Matter Seminar, Michigan State University, 3/3/89.

25. "Superfluid Transition in Porous Media", Quantum Fluid and Solid Meetings, Gainesville, FL, 4/25/89.

26. "Statics and Dynamics of Polymers in Porous Media", Condensed Matter Seminar, EXXON Research and Engineering Co., 3/28/89.

27. "Statics and Dynamics of Polymers in Porous Media", Statistical Physics Seminar, IPST, University of Maryland, 5/2/89.

28. "Statics and Dynamics of Polymers in Porous Media" American Chemical Society meeting, Miami, 9/14/89.

29. "Polymers in Disordered Media", Physics Colloquium, Clark University, 11/7/89.

30. "Polymers in Disordered Media", Condensed Matter Seminar, Harvard University, 2/8/90.

31. "Static and Dynamic Properties of Polymers in Random Environments", invited talk, MRS Fall Meeting, 11/26/90.

32. "Phase Transitions in Fractal Porous Media", Condensed Matter Seminar, Penn State University, 2/18/91.

33. "Phase Transitions in Fractal Porous Media: Helium in Aerogel", Colloquium, Kent State University, 10/24/91.

34. "Non-equilibrium Pattern Formation and Computational Complexity", Condensed Matter Seminar, University of Massachusetts, 4/2/92.

35. "Phase Transitions in Fractal Porous Media: Helium in Aerogel",Condensed Matter Seminar, University of California at Santa Barbara, 4/30/92.

36. "Statistical Physics and Complexity Theory",Theoretical Computer Science Seminar, University of Massachusetts, 11/24/93.

37. "Phase Transitions in Porous Media with Long Range Correlations: The Superfluid Transition in Aerogels", Institute for Advanced Studies seminar, 5/26/93

38. "Phase Transitions in Porous Media with Long Range Correlations: The Superfluid Transition in Aerogels", Gordon Research Conference (condensed matter), 6/29/93

39. "Complexity in Statistical Physics and Computer Science", Physics Colloquium, University of New Hampshire, 10/25/93.

40. "Computational Complexity and Pattern Formation in Statistical Physics", Statistical Physics Seminar, Institute for Physical Science and Technology, University of Maryland, 11/23/93.

41. "The Computational Complexity of Pattern Formation", Materials Research Society invited talk, 12/1/93.

42. "Computational Complexity And Non-Equilibrium Growth Models", Physics Seminar, NEC Research, Princeton, NJ, 12/14/93.

43. "A Self-Organized Algorithm for Equilibrium Critical Points", Statistical Physics Seminar, Boston University, 9/30/94.

44. "A Self-Organized Algorithm for Equilibrium Critical Points", Condensed Matter Seminar, University of Massachusetts, 10/13/94.

45. "Quantum Computers", Computer science theory seminar, University of Massachusetts, 11/1/94.

46. "Phase Transitions of Fluids in Porous Materials", Chemical Engineering Colloquium, University of Massachusetts, 4/6/95.

47. "Cluster Algorithms for Critical Points in Statistical Physics", Computer Science seminar, University of California at Berkeley, 2/12/96.

48. "Invaded Cluster Algorithm for Equilibrium Critical Points", Physics Department seminar, University of California at Los Angeles, 2/13/96.

49. "Self-Organized Algorithm for Equilibrium Critical Points", Physics Department seminar, Rockefellar University, 3/5/96.

50. "Computational Complexity and Problems in Statistical Physics", Rutgers Statistical Mechanics meeting, invited talk, 5/10/96.

51. "The Parallel Complexity of Randomized Fractals", IRREGULAR'96 meeting, invited talk, 8/20/96.

52. "Complexity in Statistical Physics and Computer Science", Physics Department colloquium, Case Western, 9/19/96.

53. "Complexity Theory Applied To Statistical Physics", Computer Science Department theory seminar, University of Massachusetts, 10/5/96.

54. "New cluster algorithms for equilibrium phase transitions", DIMACS meeting on Combinatorial Optimization and Disordered Materials Conference, 5/17/97.

55. "New cluster algorithms for simulating equilibrium phase transitions", Physics Colloquium, Bar-Ilan University, 11/17/97.

56. "New cluster algorithms for simulating equilibrium phase transitions", Condensed Matter Seminar, Weizmann Institute , 11/26/97.

57. "Parallel computational complexity theory in statistical physics", Scientific computing Seminar, Technion-Israel Institute of Technology, 12/16/97.

58. "New cluster algorithms for simulating equilibrium phase transitions", Condensed Matter Seminar, Tel Aviv University, 12/22/97.

59. "Invaded cluster algorithm for equilibrium critical points", Recent Developments in Computer Simulation Studies in Condensed Matter Physics (workshop), University of Georgia, Athens 2/23-27/1998

60. "Complexity in Physics and Computer Science", Physics Colloquium, Amherst College, 4/9/98.

61. " New cluster algorithms for critical points", Computational Science Center seminar, Boston University, 10/9/98.

62. "How to define complexity in statistical physics", New England Complex Systems Institute session on statistical physics and complexity, MIT, 10/24/98.

63. "Computational complexity in physics", Symposium in honor of Harvey Gould, Clark University, 11/6/98.

64. "Complexity of pattern formation in statistical physics", workshop on Constructive Cellular Automata, Santa Fe Institute, 11/16/98.

65. "Computational complexity in statistical physics", Condensed Matter Theory Seminar, Harvard, 5/6/99.

66. "Overcoming long time scales at equilibrium critical points", Research Seminar, Santa Fe Institute, 7/22/99.

67. "New cluster algorithms for equilibrium phase transitions", U.S.-Japan Bilateral Seminar, Understanding and Conquering Long Time Scales in Computer Simulations, Maui 7/27-30/1999.

68. "Computational complexity in statistical physics", Physics Colloquium, Syracuse University, 11/11/99.

69. "New cluster algorithms and results for the random field Ising model", Rutgers Statistical Mechanics meeting, invited talk, 12/11/99.

70. "Computational complexity in statistical physics", March APS meeting, Seattle, invited talk, 3/12/01.

71. "Algorithms and results for the random field Ising model", Condensed Matter Seminar, University of Rochester, 3/25/02.

72. "Complexity in statistical physics and computer science", Physics Colloquium, University of Missouri, Rolla, 12/12/02.

73. "The critical point of the random field Ising model," Berkeley Statistical Mechanics meeting, invited, 1/11/03.

74. "The critical point of the random field Ising model," Condensed Matter Seminar, UMass Amherst, invited 3/27/03.

75. "What is the best way to simulate an equilibrium classical spin model?" Metropolis Algorithm 50th Anniversary meeting, Los Alamos, invited, 6/11/03.

76. "Computational complexity and growth models in statistical physics" Los Alamos, CNLS Colloquium, 9/20/04.

77. "Energy cascades and power law tails in granular gases" Brown University, condensed matter seminar, 4/7/05.

78. "Parallel Computational Complexity and Statistical Physics" invited talk, Understanding Complex Systems, University of Illinois, 5/17/05

79. "Parallel Computational Complexity and Statistical Physics", Wesleyan University, Physics Colloquium, 9/15/05.

80. "Energy Cascades and Power Law Tails in Granular Gases" Widely Applied Math seminar, Harvard University, 12/14/05

81. "Graphical Representations and the Phase Transition of the Ising Spin Glass" Rutgers Statistical Mechanics meeting, invited talk, 5/9/06.

82. "Complexity, Parallel Computation and Statistical Physics" Consortium of the Americas for Interdisciplinary Science seminar, University of New Mexico, 6/5/06.

83. "Phase Transitions in the Random Field Ising Model" Consortium of the Americas for Interdisciplinary Science seminar, University of New Mexico, 6/6/06.

84. "Complexity, Parallel Computation and Statistical Physics" Santa Fe Institute, 6/7/06.

85. "Phase Transitions in the Random Field Ising Model", International Workshop on Simulational Physics, Xi'an, China, 11/12/06.

86. "Complexity, Parallel Computation and Statistical Physics", International Workshop on Simulational Physics, Xi'an, China, 11/12/06.

87. "Complexity, Parallel Computation and Statistical Physics", Hangzhou Workshop on Simulational Physics, Hangzhou, China, 11/15/06.

88. "Phase Transitions in the Random Field Ising Model", Hangzhou Workshop on Simulational Physics, Hangzhou, China, 11/16/06.

89. "Complexity in Statistical Physics and Computer Science", Clark University, Physics Colloquium, 4/5/07.

90. "Simulating Disordered Spin Systems: Exploring Rough Free Energy Landscapes", UMass/Heidelberg Workshop 5/23/07.

91. "Graphical Representations and Cluster Algorithms," Newton Institute Workshop on Markov Chain Monte Carlo Methods, 3/27/08.

92. " Energy Cascades and Power Law Tails in Granular Gases, "UMass Applied Math seminar, 12/2/08,

93. "Efficient Monte Carlo Methods for Spin Systems", UMass-Heidelberg Workshop on Computational Physics, University of Heidelberg, 1/23/09.

94. "Graphical Representations for Spin Glasses: Theoretical and Computational Considerations," Workshop on Spin Glasses, Centre Researches Mathematiques, 6/10/09.

95. "Physics and Phase Transitions in Parallel Computational Complexity," Physics of Algorithms, Santa Fe, 8/31/09.

96. "Statistical Physics and Parallel Computational Complexity," UMass Theoretical Computer Science seminar, 11/24/09.

97. cornell seminar "Physics and phase transitions in parallel computational complexity" Cornell condensed matter seminar, 4/20/10.

98. "Monte Carlo Methods for Rough Free Energy Landscapes," Rutgers Statistical Mechanics Meeting, 5/9/10.

99. "Parallel Tempering and Population Annealing for Rough Free Energy Landscapes," workshop on Monte Carlo Algorithms, Melbourne, 7/26/10.

100. "Complexity, Parallel Computation and Statistical Physics", Workshop on "Randomness, Structure and Causality: Measures of Complexity from Theory to Applications", Santa Fe Institute, 1/13/2011.

101. "Complexity, Parallel Computation and Statistical Physics", High Energy Seminar, UMass Physics, 2/4/2011.

102. "Monte Carlo Methods for Rough Free Energy Landscapes", Statistical Physics Seminar, University of Maryland, 4/12/2011.

103. "Monte Carlo Methods for Rough Free Energy Landscapes", Physics Department, Georgetown University, 4/13/2011.

104. "Granular Gases with Extreme Driving," Gordon Conference on Granular & Granular-Fluid Flow, Davidson College, 7/24/2012.

**Grants**

1. NSF Grant to attend STATPHYS 15, July 25-29, 1983.

2. Inst. for Theoretical Physics, Santa Barbara to attend Workshop in the Physics of Disorder, 1983.

3. NSF DMR-8317442 starting May 1, 1984 for three years at the level of $30,000 per year.

4. Nato Travel Grant (with J.R. Dorfman and M.H. Ernst) used 1/85 for travel to Holland.

5. NSF DMR-8702705 starting July 15, 1987 for three years at the level of $43,000 per year.

6. Faculty research grant, University of Massachusetts, $2500, 1989.

7. NSF DMR-9014366 starting July 15, 1990 for three years at the level of $43,000 per year.

8. NSF DMR-9311580 starting July 15, 1993 for three years at the level of $58,000 per year.

9. NSF DMR-9632898 starting Sept 23, 1996 for three years at the level of $75,000 per year.

10. NSF DMR-9978233 starting November 18, 1999 for three years at the level of $85,000 per year.

11. NSF DMR-0242402 starting March 31, 2003 for three years at the level of $90,000 per year.

12. NASA NAG32870 starting March 26, 2003 for two years at the level of $57,500 per year, with Nikolay Prokofiev

13. NSF DMR-0907235 starting August 1, 2009 for three years at the level of $95,000 per year.

14. NSF DMR-12080406 starting September 1, 2012 for three years at the level of $102,000 per yer

**Teaching**

*Undergraduate*

Weather and Our Atmosphere (A105)

The Physics of Music (115)

Introductory physics discussion sections (141,161,162)

Introduction to Physics II (132)

Computational Physics (290S)

Meteorology (354)

Solid State Physics (558)

Statistical Physics (423)

*Graduate*

Statistical Mechanics (602)

Mathematical Methods of Physics (605)

Solid State Physics (715)

Superfluids and Superconductors (716)

Advanced Statistical Physics (817)

Advanced Theoretical Physics (890)

Monte Carlo Methods (860C)

Classical Mechanics (601)

**Masters Students**

Andreas Lucke (M. Sc. 1995)

Stephan Burkhardt (M. Sc. 2010)

**Doctoral Students**

Steven Moore (Ph.D. 1985)

Scott Cohen (Ph.D. 1986)

Siu-Kau Chan (Ph. D. 1990)

Bruce Reinhold (Ph. D. 1992)

Mengshe Cao (Ph. D. 1995)

Yongsoo Choi (Ph. D. 1997)

Kenneth Moriarty (Ph. D. 1998)

Ilija Dukovski (Ph. D. 2001)

Xuenan Li (Ph. D. 2002)

Yong Wu (Ph. D. 2005)

Donald Blair

Wenfeng Kang (Ph. D. 2010)

Burcu Yucesoy

**Major Committee Assignments**

Personnel Subcommittee, 1984-85,90-91,91-92,93-94,94-95,96-97,99-00,00-01,09-10

Chair, Condensed Matter Theory Search, 1997-98, 98-99

Chair, Low Temperature Search, 1985-86

Co-chair, Condensed Matter Experimentalist Search, 1986-87

Chair, Condensed Matter Experimentalist Search, 1987-88

Chair, Qualifying Exam Committee, 1995-1997

Chair, Awards Committee, 2007-11

Condensed Matter Seminar

Graduate Advisor

Undergraduate Advisor

Physics Colloquium

Natural Science and Mathematics College Personnel Committee, 2001-2003

Natural Science and Mathematics College Computing Task Force, 2004

Biology Head Search Committee, 2004

Mathematics Head Search Committee, 2005

Associate Dean Search Committee, 2008

Chemistry Head Search, 2009

Chair, Personnel Committee, 2011-12, 12-13