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 to February 1971 and from October 1974 to August 1995. He and fellow Dead drummer Bill Kreutzmann earned the nickname "the rhythm devils".
Michael Steven Hartman was born in Brooklyn and grew up on Long Island attending Lawrence High School before dropping out as a senior and leaving for Europe.
Hart became interested in percussion as a grade-school student. A few months out of high school he discovered the work of Nigerian drummer Babatunde Olatunji. Olatunji later taught Hart and collaborated with Hart and the Grateful Dead on a regular basis.
Before joining the Grateful Dead, Hart and his father, Leonard Hart, a champion rudimental drummer, owned and operated Hart Music, selling drums and musical instruments in San Carlos, California.