Hon. Mary M. Johnston

Mary M. Johnston has served as a judge on the New Castle County Superior Court in Delaware since her appointment in 2003, with her current term set to expire in 2027. She has a distinguished legal career that includes serving as chief counsel for the Delaware Supreme Court's Office of Disciplinary Counsel and previously partnering at Morris James LLP. In her judicial capacity, she is a member of the court's Complex Commercial Litigation Division. Johnston holds a B.A. in music from Wittenberg University, an M.A. in music from Northwestern University, and a J.D. from Washington & Lee University School of Law. Her professional accolades include the Bar Association's Women’s Leadership Award, membership on several Delaware legal committees, and leadership roles within the Delaware State Bar Association.