On 28th of August 1993, Peter got married to Elizabeth Rogers. Elizabeth Rogers is the West Coast agent for Calvin Klein. From this marred life, they also had a child named Emmett Berg. Though he was happy to have her as his loving wife, this married life ended in a divorce in 2002. He is not involved in any kind of extra affairs and he doesn't have any girlfriend.
Peter attended The Taft School as a child and he graduated from there in 1980. After that he joined Macalester College where he studied theater arts and theater history. He graduated from there in 1984. With a dream to pursue his acting career, he moved to Los Angeles the following year. He finally made his acting debut in 1988 by starring the role of Jerome Sawyer in "Champagne High" in the TV series, 21 Jump Street. That year he also appeared in Quiet Victory: The Charlie Wedemeyer Story. His breakthrough role came in 1995 after he began starring the role of Dr. Billy Kronk in the TV series, Chicago Hope. He began his directorial career since 1997. That year he directed Chicago Hope’s Colonel of Truth. His net worth is said to be around $30 million dollars.