Dr. Mark Plummer received his PhD in history from the University of Kansas in 1960. He became a Professor of History at Illinois State University in the same year, where he worked until his retirement in 1994. While at Illinois State, Dr. Plummer taught courses in American and Asian history, and served as Departmental Chair on three occasions. He also served as President of the Illinois State Historical Association in 1985. Some of his major publications include works on Governor Richard Oglesby and orator Robert G. Ingersoll.