- Graduated from Princeton University class of 1993.
- Was a wrestler in High School and won the State Championship.
- Is a constant supporter and activist for AIDS charities.
- Father of Lila Jane and Frisco Jones.
- Most of the people in his family are lawyers.
- Is occasionally misidentified as being the son of actor Harvey Fierstein. His father's name is actually Harvey Feuerstein.
- When director Nancy Meyers was casting What Women Want (2000) her daughter recognized Feuerstein from Practical Magic (1998) and other endeavors. She insisted that her mother cast him.
- Most favorite role was the weaselly junior suit in Albert Brooks' The Muse (1999) Most hated role was the short-term sex partner who Cynthia Nixon had to fake orgasms for on Sex and the City (1998).
- Won a full scholarship to the London School of Dramatic Arts and studied with the top clown teacher at Ecole Phillipe Gaulier in France.
- Was named one of People's 50 Most Beautiful People in 2003.
- Is often photographed either shirtless or wearing a bow-tie.
- He is of Eastern European Jewish descent (including ancestors from Odessa and Galicia).
- A New York writer mentioned that even though he was dubbed a "sitcom jinx" in many circles, it never stopped him from being hired for another one. He has remained consistently employed in TV and film for over 25 years.
- His brother is a successful real estate attorney.
- Was given the nickname of "Chaplin" on the set of Giving It Up (1999) for his uncanny knack with physical slapstick by the writer/director Christopher Kublan.
- Appeared with Lauren Graham in both Caroline in the City (1995) as the lead's love interests and Conrad Bloom (1998) as the stars.
- He was named "It Phoenix" by the June 30th 2000 issue of Entertainment Weekly due to his rise from the ashes after the demise of his NBC sitcom Conrad Bloom (1998).
- He has played executives in an advertising company dealing with women issues in Conrad Bloom (1998), Giving It Up (1999), and What Women Want (2000).
- The underrated cult-hit Fired Up (1997) was canceled after a little over a season and a half. The disappointing Conrad Bloom (1998) lasted a little less than a whole season. Good Morning, Miami (2002) marked his first successful TV lead.
- Wrote an 193-page school thesis: "Every Man is A King: An Actor's Journal."
- Was on a panel of judges for a film festival sponsored by Princeton in Hollywood.
- Was dubbed by wags as "Murderer of a thousand sit-coms" and "sit-com kryptonite" due to his lack of success as a lead in Conrad Bloom (1998), The Heart Department (2001), and Good Morning, Miami (2002).
- [July 2005] Is working on the new medical drama 3 lbs. (2006), exec-produced by Barry Levinson and Tom Fontana, starring Stanley Tucci. Only 8 episodes were produced, before CBS canceled it.
- Sit-com switch-hitter whose best success lies in guest-spots and recurring roles (Caroline in the City (1995), Ally McBeal (1997), The West Wing (1999), and Once and Again (1999)) and has struck out as a regular (Fired Up (1997), Conrad Bloom (1998), and Good Morning, Miami (2002)).
- Completed production on In Her Shoes (2005). (September 2005)
- He and his wife together collaborated on the TV show "9JKL" as it was based on their own life. They both wrote and executive-produced the show. But only Mark acts on it.
- His mother is named Audrey.
- He originated the role of Uncle Morty in Pulitzer Prize-winning Jules Feiffer's "A Bad Friend".
- Currently working on The Wedding Weekend (2006). (October 2005)
- Lives in Los Angeles, California, USA.
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