He is currently involved in two multi-year projects:
Through a collaborative NSF HOMINID grant (with researchers at Stony Brook, U Mass), he is measuring metabolic cost and muscle function in chimpanzees and humans, and combining these data with dynamic simulation of fossil hominins. The broad aim of this work is to better understand the selective pressures that drove the origins and evolution of hominin locomotion, as well as improve our abilities to predict the kinematics, cost and ranging behavior of the earliest hominins.

He is also investigating the physiological basis of walking, running and climbing, using lemurs as model nonhuman primates (with researchers at Duke, WVSOM, Dartmouth). This work includes measurements of daily energy expenditure using doubly-labeled water, as well as observations of activity budgets in free-ranging lemurs.

He also maintains active research interests in bone biology and the comparative method.