Ian Matthias Bavitz (born June 5, 1976), better known by his stage name Aesop Rock, is an American hip hop artist and producer residing in San Francisco, California. He was at the forefront of the new wave of underground and alternative hip hop acts that emerged during the late 1990s and early 2000s (decade). He was signed to El-P's Definitive Jux label until it went on hiatus in 2010. The music site betterPropaganda ranked him at number 19 at the Top 100 Artists of the Decade. He is a member of the groups The Weathermen, Hail Mary Mallon (with Rob Sonic & DJ Big Wiz), and Two Of Every Animal (with Cage).

Regarding his name, he said: "I acquired the name Aesop from a movie I had acted in with some friends. It was my character's name and it sort of stuck.

The rock part came later just from throwing it in rhymes. " Bavitz was born at Syosset Hospital in Syosset, New York and raised in Northport, Long Island, New York to his father Paul and mother Jameija.

Ian has two brothers: Chris (born 1975) and Graham (born 1977). Ian, along with his siblings, was raised Catholic but later on in his life became agnostic.

Bavitz attended Northport High School in 1990 and graduated in 1994. He married Allyson Baker, guitarist and vocalist of rock band Dirty Ghosts in 2005.

They resided in San Francisco, California but have since divorced. He has tattoos on each forearm.

His left arm says the words "Must Not Sleep... ", and the right says "Must Warn Others," which are quotes inspired by the 1956 film Invasion of the Body Snatchers.

Aesop Rock has used these quotes as lyrics in the chorus of his song "Commencement at the Obedience Academy": "Must not sleep; must warn others / Trust blocks creep where the dust storm hovers. " He also used them in his song "Antisocial," in the line "Must not sleep; must warn others / I'll tourniquet your turbulence then trample on your stutters.