Tom Constanten (born March 19, 1944 in Long Branch, New Jersey) is an American keyboardist, best known for playing with the Grateful Dead from 1968 to 1970. Known among friends and colleagues as T.C., Tom Constanten studied music at University of California, Berkeley, where he met Phil Lesh. He and Lesh studied composition with Luciano Berio, the Italian modernist composer, and both were influenced by Mahler. Constanten also studied piano with Mario Feninger. In 1967, after graduation, Constanten went to Europe to study with Karlheinz Stockhausen and Pierre Boulez.