Keyboardist for the Grateful Dead who toured with the group through much of the 1970s.
His wife recommended him as a keyboardist for the group around the time their first keyboardist was in the hospital.
He was inducted into the Rock and Roll Hall of Fame as a member of the Grateful Dead in 1994.
His son Zion played in the group BoomBox.
Jerry Garcia was his bandmate and the singer of the Grateful Dead.