I am an Assistant Professor of Mathematics at Mount Holyoke College. Previously, I was an NSF Alliance for Building Faculty Diversity Postdoctoral Fellow at Iowa State University. Before that, I got my PhD in mathematics at Washington University in St. Louis.

See my cv for more details.


I’m interested in probability theory, stochastic processes, and their applications. In the past few years I’ve worked on problems that overlap with billiard dynamical systems, differential geometry, and statistical physics.


  • In Summer 2017, I worked with Qiran (Karen) Dong and Fanyi (Young) Yang (Mount Holyoke), on a project studying random billiard systems with non-holonomic (rolling) constraints. Here is their talk.

  • In 2016, I worked with Tianle (Jeff) Yang (Iowa State) on a project studying the Lorentz gas model with random scatterer collisions.


  1. O. Aydogmus, T. Chumley, A. Matzavinos, and A. Roitershtein. Moran-type bounds for the fixation probability in a frequency-dependent Wright-Fisher model. J. Math. Biol., 76(1):1–35, 2018. [ DOI | arXiv | http ]
  2. T. Chumley, R. Feres, and M. Wallace. Exact discretization of harmonic tensors. ArXiv e-prints, Mar. 2016. [ arXiv ]
  3. T. Chumley, R. Feres, and H.-K. Zhang. Diffusivity in multiple scattering systems. Trans. Amer. Math. Soc., 368(1):109–148, 2016. [ DOI | arXiv ]
  4. T. Chumley, S. Cook, and R. Feres. From billiards to thermodynamics. Comput. Math. Appl., 65(10):1596–1613, 2013. [ DOI | arXiv ]


Current courses

In Spring 2018, I’m teaching

Past courses

  • Math 342: Probability (Fall 2017)
  • Stat 395: Independent study, Statistical Analysis of Networks (Fall 2017)
  • Math 102: Calculus II (Fall 2016)
  • Math 211: Linear Algebra (Spring 2017)
  • Math 339/Stat 344: Stochastic Processes (Spring 2017)
  • Math 342: Probability (Fall 2016)

Prior to coming to Mount Holyoke I taught:

  • Introduction to Statistics (Summer 2009, Summer 2010 at Washington University)
  • Calculus I (Summer 2008 at WUSTL)
  • Calculus II (Fall 2013, Fall 2015 at Iowa State University)
  • Linear Algebra (Summer 2012 at WUSTL, Spring 2014 at ISU)
  • Real Analysis (Fall 2014 at ISU)