My research interests focus on the myriad of smaller cumulus clouds that are ubiquitous over tropical oceans, where they are often called "trade-wind cumuli", as well as over land during fairweather. The interaction of these cumuli with atmospheric circulations on much larger scales are thought to be critical for Earth's climate. I am also interested in the processes that shape cloudiness, precipitation and the energy and momentum budget of the atmospheric boundary layer. In my work I use observations, including field campaign data, satellite data and (re-)analysis products; theoretical models, including bulk models of the cloudy boundary layer or column models of the tropical atmosphere; and Large-Eddy Simulation.