My research focuses primarily on infectious disease transmission and dynamic processes in networks. Often it's a combination of the two, studying the spread of infectious disease through contact networks.
My previous research is varied. While an undergraduate at Harvey Mudd College I was involved in several research projects, the most successful of which dealt with algorithms for ranking nodes in networks (see this paper and this paper for more detail), but I also worked with analytic approaches to finding solitons (see this paper) and asymptotic approaches to solving PDEs (see this paper). I was awarded the Stavros Busenburg prize for the top applied mathematician my year. I received a Hertz Fellowship for graduate school but declined it in order to study at the University of Cambridge. As a PhD student I studied viscoelastic instabilities. My thesis received an award from the British Society of Rheology for the best thesis on rheology in 2005. I switched fields again to study mathematical biology in the Center for Nonlinear Science at Los Alamos National Laboratory, in particular disease transmission in networks, as well as topics in information theory from which I've moved into more general questions in network dynamics and general questions in infectious disease spread.
Since then I've worked at the University of British Columbia Centre for Disease Control, the Harvard School of Public Health Center for Communicable Disease Dynamics, as a faculty member at Penn State and Monash Universities, and as a Senior Research Scientist at the Institute for Disease Modeling.
I am an editor for the Bulletin of Mathematical Biology and for the Journal of Infectious Disease Modeling.