Born Anson Adams Mount II in Prospect Heights, IL, Mount is the only child of former professional golfer Nancy Smith and late Playboy Magazine sports editor Anson Mount II. He grew up in White Bluff, TN, and attended Dickson County High School in nearby Dickson, where he landed his first acting role as a supporting player in a school play
After graduating in 1991, Mount enrolled at Tennessee's University of the South, joined a fraternity, and dedicated himself to performance art and theater. He went on to earn a master's degree in fine arts and acting from Columbia University and then joined the New York City theater scene.
Mount first made headlines in 1998, when he starred as Joshua, a gay character who represents a modern-day Jesus, in playwright Terrence McNally's controversial "Corpus Christi." In 1999, Mount made his television debut in a guest spot on Fox's "Ally McBeal" and then took a memorable turn in an episode of HBO's "Sex in the City." The part led to a recurring role on the NBC drama "Third Watch" in 2000. That same year, he appeared on film in "Boiler Room" with Giovanni Ribisi and Ben Affleck, played the title role in Hillary Birmingham's "The Truth About Tully," and portrayed a driven student filmmaker in the sequel to "Urban Legends," "Urban Legends: Final Cut."
After working on 2001's "Poolhall Junkies" with Chazz Palminteri and Rick Shroder, Mount earned a part in the star-studded "City by the Sea" with Robert De Niro, Patti Lupone, James Franco, Eliza Dushku, William Forsythe, and Francis McDormand. Mount was on the set of "City by the Sea," reading the screenplay to Tamra Davis' "Crossroads," when De Niro asked about the script. After some pushing from De Niro, Mount took the role and appeared in the movie as Britney Spears' love interest.
Anson then had recurring roles in the TV shows "Line of Fire" and "The Mountain." He then jumped back to the big screen in the Cameron Diaz movie "In Her Shoes." He followed this with another recurring role on "Conviction."
In 2011, Mount secured the starring role as Cullen Bohannan on the AMC series "Hell on Wheels." He plays a former soldier and slaveholder who follows the track of a band of Union soldiers, the killers of his wife. This brings him to the middle of one of the biggest projects in US history, the building of the transcontinental railroad.