Mickey Hart (born Michael Steven Hartman, September 11, 1943) is an American percussionist and musicologist. He is best known as one of the two drummers of the rock band Grateful Dead. He was a member of the Grateful Dead from September 1967 until February 1971, and again from October 1974 until their final show in August 1995. He and fellow Dead drummer Bill Kreutzmann earned the nickname "the rhythm devils".