Marks graduated magna cum laude from the University of Houston Law Center in 2001 where he served as an associate editor on the Houston Law Review. After law school, Marks clerked for the Honorable Harold R. DeMoss Jr. on the United States Fifth Court of Appeals for two years. In the fall of 2003, Marks joined the law firm of Baker Botts, L.L.P., in Houston, Texas where he was an associate in the trial department. At Baker Botts, Marks’ practice concentrated on commercial litigation, as well as some pro bono criminal work. Marks left Baker Botts in the summer of 2006 to join St. Mary’s University School of Law.