Crime & Justice Policy

John Zielke

  • Fellow of Practice, Crime and Justice Policy Research Program


John Zielke’s career experience includes 29 years in the area of community based corrections.  John worked with the U.S. Probation Office for over 26 years as a Probation Officer, Senior United States Probation Officer (Drug/Alcohol Treatment Specialist), Supervising United States Probation Officer, Deputy Chief United States Probation Officer, and Chief United States Probation Officer. 

While in graduate school, John conducted his Master’s thesis on the influence of probation officer recommendations on actual sentencing decisions.  While Chief Probation Officer for the Northern District of Iowa, he spearheaded a study on the effectivness of Core Correctional Practices and another study on the detection and deterrent effect of probation officer home contacts.

John has taught at Kirkwood Community College, Mount Mercy University, and the University of Iowa.

Research Interests

  • Community-based corrections

Educational Background

  • Leadership Development Program Graduate, Federal Judicial Center, Administrative Office of the United States Courts, Washington DC
  • MA, Law Enforcement Administration, Western Illinois University
  • BS, Sociology and Law Enforcement Administration, Western Illinois University