Prior to joining Venable, Harrison was an associate at a New York-based law firm, where his practice focused on commercial litigation, white collar criminal defense, and internal investigations involving accounting fraud issues, the False Claims Act, and the Foreign Corrupt Practices Act.
As a law student, Harrison served as a legal intern at the Baltimore City State's Attorney's Office. He was assigned to the Zone 3 Division, which is responsible for prosecuting criminal misconduct occurring in Baltimore City's Southwest, Northwest, and Northern police districts.