- Mathematical: density-dependent population processes, branching processes, Fleming-Viot processes, coalescent theory, and large deviations.
- Biological: demographic stochasticity, community genetics, robustness & adaptability, molecular evolution, and phylogenetics.

- Stewart, A. J.,
**Parsons, T. L.**, and Plotkin, J. B. Evolutionary consequences of behavioral diversity. - Bowen, E. J.,
**Parsons, T. L.**, Curtis, T. P., Plotkin, J. B. and Quince, C. Integrating theory and experiment to explain the breakdown of population synchrony in a complex microbial community. **Parsons, T. L.**and Rogers, T. Dimension reduction via timescale separation in stochastic dynamical systems.

- Harris, K.,
**Parsons, T. L.**, Ijaz, U. Z., Lahti, L., Holmes, I., and Quince, C. Linking statistical and ecological theory: Hubbell's unified neutral theory of biodiversity as a hierarchical Dirichlet process. To appear in*Proc. IEEE, special issue Bioinformatics of DNA* - Stewart, A. J.,
**Parsons, T. L.**, and Plotkin, J. B. (2012) Environmental robustness and the evolvability of populations.*Evolution*66 (5): 1598-1612. Supplementary material. - Morlon, H.,
**Parsons, T. L.**, and Plotkin, J. B. (2011) Reconciling molecular phylogenies with the fossil record.*Proc. Natl. Acad. Sci. USA*108 (39): 16327-16332. Cover. Commentary by Tanja Stadler. - Draghi, J. A.,
**Parsons, T. L.**,and Plotkin, J. B. (2011) Epistasis increases the rate of conditionally neutral substitution in an adapting population.*Genetics*187 (4): 1139-1152. **Parsons, T. L.**, Quince, C., and Plotkin, J. B. (2010) Some consequences of demographic stochasticity in population genetics.*Genetics*185 (4): 1345-1354.- Draghi, J. A.,
**Parsons, T. L.**, Wagner, G. P., and Plotkin, J. B. (2010) Mutational robustness can facilitate adaptation.*Nature*463 (7279): 353-355. Supplementary material. **Parsons, T. L.**, Quince, C., and Plotkin, J. B. (2008) Absorption and fixation times for neutral and quasi-neutral populations with density dependence.*Theor. Pop. Biol.*74 (4): 302-310.**Parsons, T. L.**and Quince, C. (2007) Fixation in haploid populations exhibiting density dependence II: The quasi-neutral case.*Theor. Pop. Biol.*72 (4): 468-479.**Parsons, T. L.**and Quince, C. (2007) Fixation in haploid populations exhibiting density dependence I: The non-neutral case.*Theor. Pop. Biol.*72 (1): 121-135.

- An Invariance Principle for the Neutral Theory of Biodiversity and its Applications to the Human Gut Microbiome, given at l'Universite de Montreal in September 2013.
- The `Conventional Wisdom' Redux: Stochastic Evolution in Multi-strain Epidemics, given at the University of Glasgow in August, 2012.
- Inferring Diversity Dynamics, given at McMaster University in October, 2011.
- A Mathematical Framework for Density Dependent Population Genetics, given at U.C. Santa Cruz in April, 2011.
- Neutrality, Epistasis & Evolvability: Can the Topology of Genome Space Affect Evolution?, given at the University of Waterloo in June, 2010.

- Endowed with an Extra Sense : Mathematics and Evolution, historical talk given to the Cambridge University Mathematics Society in October, 2014.
- Bifurcation, Hysteresis, Catastrophe, a sculpture installation with
with artists Jebney Lewis and K. R. Wood. Covered by
*The Scientist*as Catastrophic art.

- Ph.D.: Asymptotic Analysis of Some Stochastic Models from Population Dynamics and Population Genetics.