Research Interests The evolution of emerging human viral pathogens, in particular, fast evolving RNA viruses that have been sampled through time. Inferring evolutionary and population dynamic processes from molecular sequence data. Models of molecular evolution for phylogenetic reconstruction using maximum likelihood and Bayesian inference. Molecular clock techniques including auto-correlated clocks and over-dispersed clocks. Developing computational methods for phylogenetic and evolutionary analysis, primarily using Bayesian MCMC.