Marks began his coaching career while attending the University of Southern California, working as a player personnel assistant for the Los Angeles Clippers for three seasons, while also assisting at nearby Muir High School for two seasons. After graduating with a degree in journalism with an emphasis in public relations, Marks landed his first college coaching gig at the University of Central Missouri, helping guide the Mules to two NCAA Division II Tournament bids, including an appearance in the Elite Eight in 1995. In 1996, Marks moved to Northern Illinois as an assistant, where he was on staff for six seasons, including the Huskies' trip to the 1996 NCAA Men's Division I Basketball Tournament, where as a 14-seed, the Huskies narrowly lost, 73–72, to third-seeded Texas Tech. Marks landed his first head coaching job at Southern Vermont College in Bennington, Vermontin 2001. In his three years at the helm of the Mountaineers, Marks compiled a 57–29 record, and in his first season turned around a three-win team in to a 15-win team. The following year, in 2002–03, the Mountaineers set a school record 24–6 mark, and earned its first NCAA Division III Tournament bid. He also was the coach of the Southern Vermont baseball team. In 2004, Marks accepted the head coaching job at St. Edward's University in Austin, Texas. His success carried over as he led the Hilltoppers to a 90–52 record in five seasons, including three NCAA Division II Tournament appearances, something St. Edward's had never accomplished before. In his final season at St. Edward's, Marks recorded his fourth consecutive winning season, a feat that had not been accomplished since the 1959 through 1962 campaigns. In 2009, Marks was named the head coach of University of Texas–Pan American, where in three seasons, he has led the Broncs to a 23–73 record as the team transitioned to the Great West Conference. After leading the team to a 16−16 record in 2012–13, Marks' contract was not renewed. On June 26, 2013, Marks was named the head coach at the University of St. Francis, an NAIA school in Joliet, Illinois. He was named Chicagoland Collegiate Athletic Conference Coach of the Year in 2015. Marks was also give the Jack Bennett Award in 2015.
