Mark practiced as an auditor with Price Waterhouse early in his career, and then progressed through a series of leadership positions in the firm's internal recruiting group before joining a boutique retained executive search firm in 1999. He founded Olsen Day in 2011. Originally from upstate New York, Mark graduated cum laude from Notre Dame in 1981, where he overlapped two years with Joe Montana, and zero years with Rudy. He has served on the boards of directors of SouthWest Electronic Energy and SouthWest Electronic Energy Medical Research Institute. He currently serves on the boards of directors of the Norwegian-American Chamber of Commerce and A Child’s Hope.