He co-founded the very first stunt union, the Stuntmen's Association of Motion Pictures, with fellow stuntman Loren Janes in 1961. Geary performed stunts on such television shows as Perry Mason, Peter Gunn, Voyage to the Bottom of the Sea, Mannix and Kolchak: The Night Stalker. He also performed in such films as It's a Mad Mad Mad Mad World, The Great Race, Bullit, The Love Bug, and The Sword and the Sorcerer.