Behavioural ecologist with a broad interest in all aspects of behaviour, but with a focus on mating behaviour and sexual selection.

Ornithologist with a passion for shorebirds and the Arctic. Director of the Department Behavioural Ecology and Evolutionary Genetics at the Max Planck Institute for Ornithology in Seewiesen and Professor in Behavioural Ecology at the Ludwig Maximilian University in Munich.

His main research interests are about how sexual selection affects daily rhythms and sleep, and in understanding the link between mating behaviour, site fidelity and movement ecology.