Actor, comedian, voice artist, producer and musician who was nominated for a Golden Globe Award for Best Actor for his role in School of Rock.
He attended UCLA, where he acted with Tim Robbins in a theater troupe.
He co-founded the band Tenacious D with Kyle Glass and later starred in Shallow Hal and King Kong.
He dated comedian Kathy Griffin in 1992.
He worked with Ben Stiller on an unsuccessful series called Heat Vision and Jack.