Mark is a member of the Montgomery County, Pennsylvania, and American bar associations, as well as the Montgomery County Trial Lawyers Association. He served as the president of the Montgomery County Trial Lawyers Association in 1994. He is a member of the Pennsylvania Trial Lawyers Association and the Association of Trial Lawyers of America. Mark served on the Pennsylvania Supreme Court Disciplinary Board (1997-2003) and currently serves as chairman of the Pennsylvania Judicial Conduct Board. Mark served as past president of the Montgomery Bar Association (2000) and past president of the Montgomery Bar Foundation (2001). He was named a Pennsylvania "Super Lawyer" by Law & Politics.
From 1975-1977, Mark was the assistant district attorney, Montgomery County, PA. He earned his bachelor of arts degree at Clark University in 1971 and his law degree at Villanova University in 1975. He was admitted to practice in Pennsylvania in 1975.