Lewis Halsey is a senior lecturer in comparative and environmental physiology at the University of Roehampton. His body of publications in the main covers four topics, all of which primarily concern vertebrate environmental physiology and energetics: the respiratory physiology, energetics and behavior of ducks and cormorants; the relationships between the behavior, ecology and energetics of wild diving king penguins; comparative analysis of diving and pedestrian locomotion across species, and the development of the 'accelerometry technique' as a method for quantifying behavior and energy expenditure in terrestrial and aquatic animals.