In 1979 he was cast in the TV Series 240-Robert and appeared for only one season he also starred in the movie "Beyond The Poseidon Adventure" which was the sequel to the hit disaster movie "The Poseiden Adventure". He followed this with the role of Fielding Carlyle in the prime time soap "Flamingo Road" opposite Morgan Fairchild as his wife Constance. Two TV Movies followed, "Goliath Awaits" and "Intimate Agony" before he signed to play the role of Dr. Bobby Caldwell in 1983 in the hit TV Series St. Elsewhere. The role was a huge success for Mark as he played the romeo-doctor brilliantly. He left in 1986 after his character developed HIV.
He had a change of character completely in 1986 when he played the role of serial killer Ted Bundy in "The Deliberate Stranger". 1987 saw him with a guest role of "Sam" in the hit show "Moonlighting" as well as starring in the TV Movie "After the Promise" for which he received a Golden Globe nomination. 1987/88 saw him make three movies; the teen comedy "Summer School", the action thriller "The Presidio" in which he costarred alongside Sean Connery and Meg Ryan and the drama "Stealing Home" alongside Jodie Foster. The 80s ended with a television remake of "Sweet Bird of Youth" opposite Elizabeth Taylor and the romantic comedy "Worth Winning".
The nineties saw various failed TV shows including "Reasonable Doubt" for which he received two Golden Globe nominations for Best Actor and "Charlie Grace" as well as various TV Movies ("Long Road Home", "Shadow of a Doubt" "Original Sin) as well as an uncredited role in "Natural Born Killers" as Mickey Knox in Wayne Gayle's reconstruction, a cameo in the black comedy "The Last Supper" plus he also starred in the children's film "Magic in the Water".
1996 saw him return to medical drama's - this time the role of Dr. Jack McNeil in the hit medical show "Chicago Hope" where he starred till 2000 when the series unfortunately ended. Whilst starring in Chicago Hope he also made a cameo in "Fear and Loathing in Las Vegas" and made the films "First To Go" and "I'll Remember April". The new millennium has seen him star in various TV films including "For All Time", "The Amati Girls" and "The Crossfire Trail" as well as the mini series "And Never Let Her Go".
He then guest starred in hit political drama "The West Wing" playing Special Agent Simon Donovan, the role earned him another Emmy Nomination for Outstanding Guest Actor. He then starred in Disney's remake of "Freaky Friday" opposite Jamie Lee Curtis and the Mandy Moore film "Chasing Liberty" as well as starring in the hit NBC Show "NCIS" Mark is married to actress Pam Dawber, they have two sons.
Mark was born 2 September 1951, Burbank, California, USA. The seventies saw Mark appear in episodes of such shows as "Emergency!" "Laverne and Shirley" and "The Love Boat" he also starred in the TV Film "Eleanor and Franklin: The White House Years for which he received an Emmy nomination for Outstanding Supporting Actor and as Officier Mike Breen in the TV Series "Sam".
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