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Board Members
President: David Dickinson- Moore PD
ddickinson@cityofmoore.com
1st Vice President: Rhianna Russell- Broken Arrow PD (Ret.)
2nd Vice President: Nicole Flemming- Dept. of Corrections
nicole.flemming@doc.ok.gov
Secretary: Vacant
Treasurer: Dan Mathews - Woodward PD
dmathewswpd51@yahoo.com
Public Relations Director: Deny Oesterling- Norman PD
deny.oesterling@normanok.gov
Presidents:
2017 - David Dickinson, Moore PD
2016 - 2017 Paul Priegel, Stillwater PD
2008 - 2016 Michael Heath, Norman PD
MSgt David Dickinson has been with the Moore Police Department for 19 years, with 18 of that being a crisis/hostage negotiator. He has served as a Team Leader for his department the past thirteen years. Dickinson has been with CNOK since 2016; first as a Vice President, and President since 2017. He is retired from the Air Force, and holds a B.A. Degree in Management from the University of Maryland, and a M.A Degree in Criminal Justice from the University of Central Oklahoma. Dickinson attended the FBI Basic Crisis Negotiations Course in 2009.
Rhianna (Rhi) Russell retired from the Broken Arrow Police Department in 2025 after 24 years with 20 years as a Crisis Negotiator and Assistant for her team twelve years. Rhi first served as a Regional Representative in 2016 and became First Vice President in 2018. She attended the NTOA Annual Conference for many years. Rhi has a B.A. in Criminal Justice and Psychology from Northeastern State University. She attended the FBI Basic Crisis Negotiations Course in 2005.
Nicole Flemming serves as the Crisis Negotiation Coordinator for the Oklahoma Department of Corrections (ODOC) and has been an active crisis negotiator since 2015. She joined the Crisis Negotiators of Oklahoma (CNOK) in 2016, was elected Secretary in 2018, and later served as 2nd Vice President beginning in 2022. Ms. Flemming holds a Bachelor of Arts degree in Social Science and completed the FBI Basic Crisis Negotiations Course in 2017.
Detective Lieutenant Dan Mathews has been with the Woodward Police Department for over 16 years of his 29 years of law enforcement. He served in the Guymon, Seiling Police Departments, and the Dewey County Sheriff's Department. Mathews has been with CNOK since 2006, first serving as Region 1 Director, and currently as Treasurer since 2020. Det. Lt. Mathews attended FBI Crisis Negotiation class in 2006.
Lt. Deny Oesterling has been with the Norman Police Department for 16 years. He has been a crisis/hostage negotiator for 8 years and currently serves as the Negotiation’s Team Lead. Oesterling has been with CNOK since 2016 serving as the Public Relations Director. He served in the Air Force as an Airborne Surveillance Technician on the AWACS and holds an Associate’s Degree in CyberSecurity from Rose State College. Oesterling attended the FBI Basic Crisis Negotiations Course in 2015.
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