Mickey Hart is an American percussionist and musicologist 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 July 1995. Mickey Hart has hand signed this 11.5x14 Mat with Grateful Dead 3.5x5.5 Photo. Note: Mat is signed as shown. JSA Authentication Sticker #Q17222 and JSA Certificate of Authenticity.