Brother in-law of Adam McKay.

Shares a birthday with Kevin Spacey, Sandra Bullock and Kate Beckinsale.

Divides his time between Malibu, California and Chicago.

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

Was a member of the Pi Kappa Alpha fraternity.

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

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

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

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.

Brother of Shira Piven

Frequently acts in movies with John Cusack, such as: Bob Roberts (1992), Elvis Stories (1989), Floundering (1994), The Grifters (1990), Grosse Pointe Blank (1997), One Crazy Summer (1986), The Player (1992), Say Anything... (1989), Serendipity (2001), Runaway Jury (2003).

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

Son of Byrne Piven and Joyce Hiller Piven.

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

Shared an apartment with John Cusack.

Was a graduate of Evanston Township High School.