Hahn is an author, lecturer, and consultant. He founded the Department of Criminal Justice at Xavier University in Cincinnati, Ohio, and served as Department chair until his retirement in 1997. Before that he was Chief Probation Officer and Director of Court Services for a large metropolitan area juvenile court and was cofounder and Director of one of the earlies halfway houses for delinquent boys in the United States. He served on the faculty of the National College of Juvenile and Family Court Judges (Reno, NV) for several years and at the National Conference on Corrections Policy (Williamsb...