- The other two Beastie Boys admitted that he was the author of about 80% of the music on the album "Hello Nasty".
- Few people know that he suffered from a major epileptic fit, caused from flash photography. His seizures are now under control and is under constant medical supervision.
- Is the Beastie Boys' guitarist.
- He and ex father-in-law Donovan were inducted into the Rock and Roll Hall of Fame on the same night.
- His mother died of causes related to alcoholism while he was in his teens.
- He is of Ashkenazi Jewish (father) and Irish (mother) descent.
- Pursued an acting career in the late 1980s and early 1990s, typically getting James Dean-style parts as brooding, troubled young men. He apparently abandoned his acting career in 1994, although he returned to the screen in Noah Baumbach's While We're Young (2014).
- Best friend is actress Nadia Dajani.
- Shares a birthday with Vanilla Ice.
- Although he plays guitar with the Beastie Boys, Adam is also skilled on the drums, keyboards, and bass.
- Son of Israel Horovitz
- Brother of Rachael Horovitz and Matthew Horovitz
- Although born while his mother was visiting in New Jersey, he was raised in Manhattan, where he still lives.
- Former brother-in-law of Donovan Leitch Jr., Astrella Celeste, Oriole Nebula Leitch and Shaun Ryder.
- Ex-son-in-law of Donovan and Enid Graddis.
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