Board Members
SSgt David Dickinson has been with the Moore Police Department for 15 years, with 14 of that being a crisis/hostage negotiator. He has served as a Team Leader for his departmental the past eight 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.
Detective Rhianna Russell has been with the Broken Arrow Police Department for 23 years and a Crisis Negotiator for the last 18 years. She has been the Assistant Team Leader for her team the last eleven years. Det Russell first served as a Regional Representative in 2016 and became First Vice President in 2018. She attended the NTOA Annual Conference for many years. Det Russell 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 was a ten-year employee with the Oklahoma Department of Corrections (ODOC) until her recent move to the AG's office. She has served seven years as a crisis negotiator. In 2020, Ms. Flemming was appointed as the Assistant Team Leader of the ODOC Crisis Team, and Team Leader in 2022. She joined CNOK in 2016, was elected Secretary in 2018, and 2nd Vice President in 2022. Ms. Flemming studied at California State University, Stanislaus, and Ashford University, where she holds a B.A. Degree in Social Science. She attended the FBI Basic Crisis Negotiations Course in 2017.
Lt. Deny Oesterling has been with the Norman Police Department for 13 years. He has been a crisis/hostage negotiator for 7 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.
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.
SSgt Rebecca Miller has been with the Moore Police Department for 14 years, with 13 of that being a crisis/hostage negotiator. Miller has been with CNOK since 2016 and Region 4 Director since 2017. Miller holds a B. A. Degree in Agribusiness from Oklahoma State University and a M. A. Degree in Criminal Justice from East Central University. She attended the FBI Basic Crisis Negotiations Course in 2010.
