An atmospheric scientist with a background in physics and a PhD from the Max Planck Institute for Meteorology in Germany. Before joining the Department of Geography as University lecturer in Cambridge he worked for a number of years as a research scientist at the University of Michigan and the Geophysical Fluid Dynamics Laboratory in Princeton, New Jersey. His research interests develop around the interactions between dynamical and microphysical processes in the atmosphere. To study those interactions he applies and develops numerical models and process modules. Research activities include the development of atmospheric models from local to global scales, the modelling of convective clouds and plumes, the role of convection in the climate system, and the impact of aerosols on dynamical and microphysical processes.