Trivia

Shared an apartment with John Cusack.

Parents ran a theatre school in Chicago which John Cusack, Joan Cusack and Ann Cusack attended.

His character Ari in HBO's Entourage (2004) is based on real-life Hollywood agent Ari Emanuel.

Frequently acts in movies with John Cusack, such as: Bob Roberts (1992), Elvis Stories (1989), Floundering (1994), Les arnaqueurs (1990), Tueurs à gages (1997), Un été fou fou fou (1986), The Player (1992), Un monde pour nous (1989), Un amour à New York (2001), Le Maître du jeu (2003).

Has played drums for most of his life, and plays them quite well.

He got malaria while filming PCU (1994) and had to be rushed to the hospital.

Studied acting at the National Theatre in London.

He is of Russian Jewish and Ukrainian Jewish descent.

Brother in-law of Adam McKay.

Divides his time between Malibu, California and Chicago.

Was a graduate of Evanston Township High School.

Attended, with Billy Zane, Harand Theater Camp in Elkhart Lake, WI, as a teenager. He played Bernardo in "West Side Story" there.

He owns a house in Malibu, California, which he purchased from hockey star Chris Chelios.

He was also supposed to star alongside his best pal John Cusack in High Fidelity (2000), but had to pull out due to other commitments.

Attended Drake University in Des Moines, Iowa. While in school, he performed in plays such as "Julius Caesar.".

Endorsed Bernie Sanders in the 2016 presidential election of the United States.

Studied acting at the Eugene O'Neill Theater Center in Waterford, CT.

Was a member of the Pi Kappa Alpha fraternity.

Was considered for the role of Dolarhyde in Dragon rouge (2002).

Younger brother of Shira Piven.

Son of Byrne Piven and Joyce Hiller Piven.

In Cincinnati Bell commercials (2005)

He is an alumnus of the Piven Theatre Workshop founded by his parents (Byrne Piven and Joyce Hiller Piven) and a one time Chicago stage actor.

Uncle of Pearl McKay and Lili Rose McKay.

On Broadway in Speed the Plow (November 2008)