Drummer with Jefferson Starship from 1974 until 1978 and with Jefferson Airplane for its final album and tour.
He worked as a session drummer before The Turtles enlisted him for his first professional breakout gig.
He was a member of Crosby, Stills, Nash & Young.
He and his wife Angie occasionally collaborated on musical projects.
He met Albert Einstein once as a child, after his parents towed Einstein back to shore when the physicist's boat ran out of gas on a lake.