Adam Keefe Horovitz (born October 31, 1966),[1][2] popularly known as Ad-Rock, is an American rapper, guitarist, and actor.

[6] Horovitz began his music career with a stint in the punk rock band The Young and the Useless, who often performed with Beastie Boys.

The album was a huge commercial success, and spawned six singles; however, only one would reach the top twenty of the US Hot 100, "(You Gotta) Fight for Your Right (To Party!)"

In addition to his work with Beastie Boys, Horovitz also remixes numerous tracks for other artists under the alias 41 Small Stars.

Some of his roles include Tim 'Chino' Doolan in Lost Angels (1989), Sam in Roadside Prophets (1992), Repulski in Godspeed (2007), Fletcher in While We're Young (2014), and Nick in Golden Exits (2017).

[13] Horovitz appeared prominently in The Punk Singer, a 2013 documentary film about Hanna's life and career, and even shot some scenes.