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Johnston Police - Staff Bios

You may contact any member of the Johnston Police Department by calling (515) 278-2345 or by e-mail.

Chief Bill Vaughn

Chief Bill VaughnChief Vaughn has over 30 years of law enforcement experience, having been responsible for all aspects of public law enforcement operations. As chief, Vaughn is responsible for setting direction for the department and managing the department staff, including 22 sworn officers.

 

Lieutenant Lynn Aswegan

Lt. Aswegan began his law enforcement career in 1986. He is the department's lead investigator, coordinates department training and is responsible for setting special operations for the department. Voicemail for Lt. Aswegan can be left at (515) 252-1363.

Sergeant Jason Gudenkauf

Sgt. Gudenkauf commands the evening shift. He began his law enforcement career in 1999 with the Marshalltown Police Department where he became a certified Field Training Officer. He joined the Johnston Police Department in 2004. Sgt. Gudenkauf is currently a member of the Suburban Emergency Response Team (SERT), Firearms Instructor, Rifle Instructor, and member of the Bike Patrol Unit. Voicemail for Sgt. Gudenkauf can be left at (515) 252-1375.

Sergeant Eric Spring

Sgt. Spring commands the afternoon shift. He began his law enforcement career at the Lucas County Sheriff's Office where he became a certified ASP Instructor. He joined the Johnston Police Department in December 2003. Sgt. Spring is a Certified Less Lethal/Extended Impact Instructor (Beanbag) and the Field Training Supervisor for the Department. Sgt. Spring is also a member of the JPD Bike Patrol.  If you have an off duty event request or questions, contact Sgt. Spring at (515) 278-2345. Voice mail for Sgt. Spring can be left at (515) 252-1372 or email at espring@police.ci.johnston.ia.us

Sergeant Kenny Agan

Sgt. Agan was a Military Police Officer with the US Army from 1987-1996.  Sgt. Agan began his civilian law enforcement career with the Ankeny Police Department in 1996 and joined the Johnston Police Department in 2006. Sgt. Agan is currently the school resource officer (SRO) for the department and Johnston Community School District. Sgt. Agan is a member and instructor of the JPD Bike Patrol.  Voicemail for Sgt. Agan can be left at (515) 334-2340.

Sergeant Tyler Tompkins

Sergeant Tompkins joined the department in 2003. Sgt. Tompkins is a defensive tactics instructor as well as a Taser (less-lethal) Instructor. Sgt.Tompkins can be reached at (515) 252-1367.

Detective Travis Hamilton

Detective Hamilton has over 10 years of law enforcement experience and has been with the Johnston Police Department for over 5 years after beginning his career with the Boone Police Department. Detective Hamilton is a graduate of Simpson College and currently working towards his Master’s Degree. In addition to Detective Hamilton’s investigative duties, he also serves the department as a Drug Recognition Expert (DRE), Field Training Officer (FTO), Field Sobriety Instructor, and a member of the JPD Bike Patrol. Voicemail for Detective Hamilton can be left at (515)252-1365.

Officer Rich Kirkeby

Officer Kirkeby has 20 years of law enforcement experience. He is the DARE officer for the department and has taught DARE for eight years. He is also the evidence custodian for the department. Voicemail for Officer Kirkeby can be left at (515) 252-1368.

Officer Scott Richmann

Officer Richmann started his law enforcement career in 1989.  Officer Richmann is a certified clandestine laboratory specialist and is trained in the handling of hazardous material and less than lethal weapons. Voicemail for Officer Richmann can be left at (515) 252-1369.

Officer Joe Siembieda

Officer Siembieda began his law enforcement career in 1990 as a reserve officer.  He worked part-time in 1991 and started full-time in 1992. He ihas served on the Strategic Anti-Felon Team (SAF-T), uniform patrol and as detective. In 2009, Siembieda returned to uniform patrol. He is also a laser radar instructor, arson investigator, accident investigator, and a firearms instructor for the department. Voicemail for Officer Siembieda can be left at (515) 252-1365.

Officer Bryan Townes

Officer Townes began his law enforcement career in 1990 as a Reserve Office.  He worked part-time in 1991 and started full-time in 1992.  He has served as a firearms instructor and laser radar instructor for the department.  In 2000, Officer Townes was assigned to the Mid-Iowa Narcotics Enforcement Task Force (MINE) as the department's drug investigator.  During his tenure at MINE he also served as a Task Force Agent for the Drug Enforcement Administration (DEA) from 2003 through 2008.  Officer Townes can be reached at (515) 270-8233 ext 127.

Officer Adam Criswell

Officer Criswell joined the Johnston Police Department in October 2005. Officer Criswell is also a defensive tactics instructor and a member of the Bike Patrol Unit.  Voicemail for Officer Criswell can be left at (515) 252-1376.

Officer Samir Dzaferagic

Officer Dzaferagic joined the Johnston Police Department in October 2005 and is a member of the JPD Bike Patrol.  Officer Dzaferagic is a graduate of Grand View College with a degree in criminal justice and minor in sociology.  Officer Dzaferagic is a collision investigator,field training officer (FTO), radar/lidar instructor, and is also the crime prevention officer for the department. Voicemail for Officer Dzaferagic can be left at (515) 252-1377.

Officer Steve Nore

Officer Nore began his career in law enforcement with the Polk City Police Department in 2004. Officer Nore joined the Johnston Police Department in 2006. Officer Nore has a B.A. from UNI.  Officer Nore is a field training officer (FTO), firearms instructor, rifle instructor, Suburban Emergency Response Team (SERT) operator, and a member of the JPD Bike Patrol.  Voicemail can be left for Officer Nore at (515) 334-2341.

Officer Dan Steck

Officer Steck began his law enforcement career in 1995 with the Fort Dodge Police Department.  Officer Steck is a crime scene technician.  He graduated from ILEA in 1996.  He has 10 years experience as a bicycle patrol officer and was a member of the Fort Dodge Tactical Team for 8 years.  Officer Steck is currently a member of the Johnston Police Department Bicycle Patrol unit. Voicemail can be left for Officer Steck at (515) 252-1371

Officer Zach Grandon

Officer Grandon is a graduate of Drake University where he majored in Law, Politics, and Society and minored in Philosophy.  Officer Grandon began his law enforcement career with the Johnston Police Department in August 2007 and graduated from the ILEA in December 2007.  Voicemail for Officer Grandon can be left at (515) 334-2342.

Officer Jessica Jensen

Officer Jensen joined the Johnston Police Department in August 2007.  Officer Jensen graduated from the ILEA in December 2007. Officer Jensen served in the United States Marine Corps for five years and holds a Bachelor of Science degree in Public Administration from Upper Iowa University.  Voicemail for Officer Jensen can be left at (515) 252-1378.

Officer Jeremy Christensen

Officer Christensen joined the Johnston Police Department in April 2009.  Officer Christensen is a graduate of Des Moines Area Community College with an associate of science degree in criminal justice.  Officer Christensen began his law enforcement career in 2006 with the Polk City Police Department and graduated from the ILEA in 2007.  Voicemail for Officer Christensen can be left at (515) 334-2343.

Officer Ryan Hanssen

Officer Hanssen joined the Johnston Police Department in September 2009. Prior to joining the Johnston Police Department, Officer Hanssen worked for the Jewell Police Department. Officer Hanssen has a Bachelors’ degree in Political Science from Iowa State University and is an Air Force veteran. Officer Hanssen is also a member of the JPD Bike Patrol.  Voicemail for Officer Hanssen can be left at (515) 252-1364

Officer Brad Lowe

Officer Lowe joined the Johnston Police Department in December 2009 and graduated from the ILEA in April 2010.  Officer Lowe is a graduate of William Penn University with an associate of arts degree in leadership studies.  He previously worked for the Polk County Sheriff’s Office as a Detention Officer. Voicemail for Officer Lowe can be left at (515) 334-2344.

Officer Erin Bush

Officer Bush joined the Johnston Police Department in April 2011.  She has a Bachelor of Science degree in Criminal Justice and graduated from the ILEA in March 2011.  Voicemail for Officer Bush can be left at (515) 252-1375.