Executive Team

Jeff Newnum is the Chief Deputy for the Yavapai County Sheriff’s Office. He has been with the agency for 25 years. He promoted through the ranks of law enforcement and has commanded both the Law Enforcement Services Division and Detention Services Division. He is a veteran of the United States Army and is a graduate of the FBI National Academy in Quantico, Virginia.

Tom Boelts is a Commander with the Yavapai County Sheriff’s Office leading the Law Enforcement Services and Administrative Services Divisions.  Tom started his career with The Yavapai County Sheriff’s Office in 1994 as a Detention Officer in the Eastern Detention Bureau.  In 1995 he became a Deputy working in the Verde Valley area.  In 2010 he was promoted to the rank of Lieutenant and assigned to the Criminal Investigations Bureau until 2016 when he was assigned as the Northern Area Command Lieutenant, he managed patrol activities for the Prescott, Ash Fork, Seligman, Bagdad and Yarnell substations.  In 2021 he was reassigned to Criminal Investigations, then in 2022 promoted to the rank of Captain and assigned to the Law Enforcement Bureau where he manages the operations of the Patrol, Criminal Investigations and PANT Bureaus. In 2023 he promoted to Commander where he now manages the Law Enforcement and Administrative Services Divisions.

Commander Tom Boelts earned a Bachelors degree in Accountancy from The University of Montana in 2004 and has completed the Senior Management Institute for Police through the Police Executive Research Forum in 2011. 

Commander Boelts has presented around Arizona and the country on Missing and Exploited child cases as well as Human Trafficking enforcement.

Brent Kimbriel is a Commander with YCSO. He began his law enforcement career in 2010. During Brent’s employment at the Yavapai County Sheriff’s Office, he has been assigned to Patrol, Search & Rescue and S.W.A.T. His assignment to these duties has been as a front-line Operator, supervising Sergeant, and commanding Lieutenant. He is now assigned as Detention Services Division Commander managing all operations for detention in Yavapai County.

Commander Kimbriel has managed numerous Search & Rescue operations and S.W.A.T operations conducted within Yavapai County. He received the Yavapai County Sheriff’s Office Medal of Merit for a hostage rescue intervention at a home with active gunfire during a patrol shift. He is committed to public safety with his Yavapai County Sheriff’s Office role in Law Enforcement Services Division and Detention Services Division.  

Richard Martin is a Captain in the Detention Services Division. He has been with the Yavapai County Sheriff’s Office since 1994. He began his career working as a Detention Officer and transferred to the Law Enforcement division in 1995. He promoted through the ranks of law enforcement. He is currently the Captain of Verde Detention Services overseeing the Camp Verde Jail facility.

Eric Stumpf is a Captain with YCSO. Eric has been with the Yavapai County Sheriff’s Office since 2006.  He promoted through the ranks of Detention Services and is currently responsible for the Prescott Detention Center.  He is a graduate of the National Jail Leadership Command Academy, Class #40.

John Johnson has served with the Yavapai County Sheriff's Office for over 19 years. He started in the Camp Verde Detention Facility and moved to patrol as a Deputy two years later. He became a detective in the Criminal Investigations Bureau, investigating serious felonies, mostly crimes against persons. John was a detective sergeant for five years, investigating or leading similar investigations.  

While in the Criminal Investigations Bureau, John began working on a Bachelor of Science in Software Engineering from ASU, an ABET-accredited degree program. He graduated with Summa Cum Laude honors in May 2021.

John was a leader in the Patrol Bureau as a Sergeant and then Lieutenant. John is an active member of the Sheriff's Office Incident Command Team, where he has led or assisted with responding to numerous fires and floods requiring evacuations.

Captain John Johnson is responsible for the Law Enforcement Services Division, leading the lieutenants in the Patrol Bureau, Criminal Investigations Bureau, PANT(an interagency narcotics taskforce), Recruitment and Training.

Samantha Russell is a long-time resident of Yavapai County.  Being involved in the community is important to her and has volunteered with the Big Brother Big Sisters organization as well as other local youth sports programs.  She joined the agency in 2006 as a Public Safety Telecommunicator with prior Human Resources experience.  She worked her way to the top of the Bureau, promoting into a Public Safety Supervisory position in 2011 and a Business Manager over Administrative Services in 2019. 

In 2022, Samantha Russell promoted to the rank of Director overseeing the operations of the Support Services, Communications and Records Bureaus of the Administrative Services Division.  She is always striving to improve public safety within the community and agency.    She has received several acknowledgments from the Sheriff’s Office over her years of service.  She attributes this motivation following an award she received from The Association of Public-Safety Communications Officials (APCO) and the National Emergency Number Association (NENA) in 2010, for her bravery and excellence in work as a public safety professional. 

During her time with the agency, Director Russell has assisted in implementing advancements to the 911 center, records management to include complying to federal mandates and serving as the 9-1-1 Administrator of Yavapai County for the State of Arizona.  She has also had the opportunity to participate in specific law enforcement and leadership programs. She credits her 16 years of experience in public safety to her success within the agency as well as her education in Human Resources and Management.

Kristin Greene is the Public Affairs and Government Relations Director. Kristin is a government relations executive with over 25 years' experience federal, state, and local lobbying; public policy development and analysis; regulatory issue research and resolution; media relations; crisis management and initiative campaigns. Her expertise lies in managing the political, policy and public aspects of all types of issues and has earned the reputation as an effective negotiator – a skill imperative to navigating public affairs issues.  

Kristin Greene’s professional background includes a long history with public agencies and municipalities, including issues such as negotiating state contracts for clients, securing zoning permits denied clients, and “closing” disputed business deals. She has also headed and won two statewide ballot initiatives, secured federal and state funds for community clinics serving the uninsured, and state and federal funding for the cities of Glendale and Avondale, Arizona.

Beya Thayer is the Executive Director of Behavioral Health Services & the Yavapai Justice & Mental Health Coalition.

Beya Thayer is a systems advocate supporting enhanced collaborations among multi-disciplinary teams and enjoys the opportunity to work as the Director of Behavioral Health Services for Yavapai County Sheriff’s Office as well as the Executive Director of the Yavapai Justice and Mental Health Coalition.  Beya works to develop and implement strategies that lead to the long-term and sustainable involvement of community institutions, organizations, and individuals within the intersections of justice and behavioral health - with the goal of addressing partnership and systems change.  Beya’s career has given her the opportunity to create partnerships and collaborations with diverse communities, professions, and agencies throughout Arizona to effect policy and change on both the micro and macro levels.