Michael Diamond, better known as Mike D (born November 20, 1965), is a founding member of New York City hip hop group the Beastie Boys. Mike D raps, sings, and plays drums.
Diamond was born in New York City to an upper-middle-class Jewish household. He attended Vassar College in Poughkeepsie, New York for six months. In 1979, Diamond co-founded the band The Young Aborigines. In 1981, Adam Yauch, aka MCA, a friend and follower of the band became their bass player, and on the suggestion of their then-guitar player, John Berry, the band changed their name to the Beastie Boys. By 1983, Adam Horovitz (Ad-Rock) joined, and their sound began to shift away from punk to hip-hop.
In 1992, Mike D founded the Beastie Boys' now-defunct record label Grand Royal Records. He is also interested in interior decoration, and designed Brooklyn-themed toile wallpaper; it was used in the renovation of the Marquee nightclub in Chelsea, which reopened in January 2013.
Personal life 
In 1993, Mike married film, television and music video director Tamra Davis; they have two children, Davis Diamond and Skyler Diamond.