Mark Feuerstein (/ˈfɔɪ.ərstiːn/; born June 8, 1971) is an American actor, writer, producer and director. He first came to public notice in a guest appearance in an episode of Season 2 of Sex and the City and went on to appear in TV series The West Wing (2001–2005), Royal Pains (2009–2016) and Prison Break (2017). He co-wrote, co-produced as well as starred in the short-lived CBS sitcom 9JKL.
Feuerstein was born in New York City, the son of Audrey, a school teacher, and Harvey Feuerstein, a lawyer. He was raised in a Jewish family and celebrated his Bar Mitzvah in an Orthodox synagogue. He was a wrestler in high school and won the state championship. Feuerstein attended The Dalton School, and graduated from Princeton University in 1993. He won a Fulbright scholarship and studied at the London Academy of Music and Dramatic Art and at L'École Phillipe Gaulier in France.
Feuerstein got his breakthrough on television as a recurring character on the daytime soap opera Loving. When director Nancy Meyers was casting What Women Want, her daughter recognized Feuerstein from Practical Magic (1998), and insisted that her mother cast him.