Harry Spiller was born in Marion, Illinois where he graduated from high school on May 28, 1963. Five days later he was in the Marine Corps in San Diego. In 1967 he was appointed to recruitment duty and assigned to cover southern Illinois and southeast Missouri. He left the Marine Corps in 1973 and returned to southern Illinois where he worked as a policeman. He returned to college, completed undergraduate and graduate degrees in Criminal Justice and Political Science from Southern Illinois University. From 1982 to 1989 he served as Sheriff of Williamson County, Illinois. He then accepted a position as Professor of Criminal Justice at John A. Logan Community College in Carterville, Illinois.
Spiller has authored nine books and numerous articles. He is the father of two children.