Mark Moses was born in New York City, where he spent his early years, before moving to Evanston, Illinois to grow up. His parents, Philip and Patricia, met in the West Village, with his father working in sales on Madison Avenue and his mother being an interior decorator.
After playing football and basketball in high school and a few years at Ithaca College, Mark stumbled into acting, eventually graduating from the NYU Tisch School of the Arts Grad Program. He found immediate success on stage, appearing on Broadway alongside Sean Penn and Kevin Bacon in "Slab Boys".
He continued to work in New York and regional theaters until he met Oliver Stone, who cast him in the academy award winning film Platoon (1986),where he played Lt. Wolfe. This led Mark to move west to Hollywood, where he worked in film, television, and theater.
Mark is most recognized for his work in television, playing a wide range of characters, including Duck Philips in Mad Men (2007),Paul Young in Desperate Housewives (2004),Dennis Boyd in Homeland (2011),President Jeff Michener in The Last Ship (2014),Jason Wolfe in Berlin Station (2016),Col. Alden Cox in Manhattan (2014),Undersheriff Jerry London in Fox television's Deputy (2020),Mr. Robot (2015),Key and Peele (2012),Man Seeking Woman (2015),and many others.
His filmography includes Platoon (1986),Cesar Chavez (2014),Mapplethorpe (2018),Fear, Inc. (2016),Seeking a Friend for the End of the World (2012),Swing Vote (2008),Letters from Iwo Jima (2006),Big Momma's House 2 (2006),After the Sunset (2004),Deep Impact (1998),Gettysburg (1993),Rough Riders (1997),The Doors (1991),Born on the Fourth of July (1989),Someone to Watch Over Me (1987),and Bombshell (2019).
Throughout his career, Mark has won three SAG/AFTRA awards. He is also an advocate for numerous charities and is married to playwright and actress Annie LaRussa, with whom he has two sons, Walker and Zane.