Best known for his role as chief resident, Dr. Mark Green on the television series, ER, his previous main television work was for the show It Takes Two.
He received a scholarship as a teenager to the Royal Academy of Dramatic Arts in England.
He is a humanitarian who acted in films, Fast Times at Ridgemont High, Top Gun and Zodiac.
He married Jeanine Lobell in 1994 and they have one son and three daughters.
He appeared in the movie Top Gun with Tom Cruise.