Chris’s work has concentrated on mesoscale and synoptic-scale phenomena such as extratropical cyclones, tropical cyclones, mesoscale convective systems, and terrain-induced flows. Work on extratropical cyclones has interpreted observed cyclone development in terms of theoretical models using potential vorticity as a diagnostic tool. Work on mesoscale convective systems has focused on mesoscale vortices produced by long-lived systems, and the possible role such vortices might have in causing subsequent heavy rainfall. Chris was co-science coordinator for the recent Bow-echo and MCV Experiment (BAMEX), a major component of which was to obtain unprecedented observations within and near mesoscale convective systems and remnant mesoscale convective vortices (MCVs) to understand their evolution and the subsequent redevelopment of rainfall.