In addition to teaching and research in hydrology and hydraulics, he has developed computer models of raptor migration, focusing on the interaction of wind and topography to simulate orographic lift used by golden eagles. This spring he also worked with scientists in Spain to model griffon vulture flight behavior near wind turbines. Dave is the founder of the Tussey Mountain Spring Hawkwatch near State College, and Chair of the Conservation Committee of HMANA. He began watching hawks at the age of 13 on the Allegheny Front in western Maryland.