I use mathematical models in order to investigate biological processes. In particular, I am currently interested in the following areas of research: (i) the dynamical interactions between infectious diseases and the immune system, and (ii) the somatic evolution of cells, the process of carcinogenesis, and the treatment of cancers. While these topics are biomedical in nature, the work is routed in ecological and evolutionary theory. The mathematical models are based on detailed biological information and provide a framework which can be used to generate new insights, to interpret experimental data, and to design new experiments. I collaborate closely with a variety of experimental laboratories in order to couple mathematical with empirical work. (iii) In addition, I am also interested in a variety of other topics in the general areas of population dynamics and evolutionary dynamics