His research has centred on the physical understanding and parameterisation of the atmospheric boundary layer and its coupling with the land surface, with applications ranging from numerical weather prediction and climate modelling to wind-energy assessment and urban meteorology. As co-founder and co-chair of the GEWEX Atmospheric Boundary Layer Study (GABLS) since 2000, he has played a leading role in international efforts to improve the representation of boundary-layer processes in weather and climate models. His surface-flux and convective-transport parameterisations have been incorporated into operational modelling systems, including those developed by ECMWF and NCAR. Author of 169 peer-reviewed publications, with an h-index of 50 in Web of Science (65 in Google Scholar) and more than 10,000 citations, he has combined fundamental advances in boundary-layer physics with sustained contributions to operational environmental prediction. The five selected publications below—addressing stable boundary layers and diurnal cycles in weather and climate models (Bulletin of the American Meteorological Society, 2013), urban finescale forecasting (Bulletin of the American Meteorological Society, 2017), the urban wind-island effect (Environmental Research Letters, 2018), wind-characteristic quality in North Sea wind atlases (Quarterly Journal of the Royal Meteorological Society, 2020), and urban rainfall derived from radar observations (International Journal of Climatology, 2020)—encapsulate a career dedicated to translating atmospheric boundary-layer science into practical advances in environmental prediction and sustainable development.