Executive Team

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Chief Deputy Jeff Newnum

Chief Deputy Jeff Newnum

Chief Deputy Jeff Newnum has been with the Yavapai County Sheriff’s Office 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.


Commander Victor Dartt

Sherrifs-Officers-9-16-21_-94.jpg Commander Victor Dartt moved from Alaska to Camp Verde to begin his employment with the Sheriff’s Office in November of 1999.  During his career with the Sheriff’s Office, he has been a patrol deputy, member of the Special Crimes Unite, Detective, K9 Sergeant, Patrol Lieutenant, Criminal Investigations Bureau Lieutenant, and Administrative Services Captain.  He now serves as Commander of both Law Enforcement Services Division and Administrative Services Division.

In all of the positions he has held with the Sheriff’s Office, Commander Dartt’s goal has been to improve public safety in the community he considers home.  As a result, he has received more than 200 subpoenas for defense interviews, evidentiary hearings and trials, leading to numerous convictions for everything from drug sales to homicide, including a 2021 conviction in a cold case homicide which occurred in 1988.

He is the recipient of the Sheriff’s Office Medal of Merit and a Purple Heart after being shot in the line of duty in 2002, during an arrest for domestic violence.


Commander Brent Kimbriel

Sherrifs-Officers-9-16-21_-123.jpg Commander Brent Kimbriel 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 Brent 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.  

Captain Richard Martin

Captain Richard Martin

 Captain Richard Martin 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.


Captain Tom Boelts

Sherrifs-Officers-9-16-21_-82.jpg Tom Boelts is a Captain with the Yavapai County Sheriff’s Office in the Law Enforcement Services Division.  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. 

Tom 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. 

Tom has presented around Arizona and the country on Missing and exploited child cases as well as Human Trafficking enforcement.



Captain Eric Stumpf

Sherrifs-Officers-9-16-21_-100.jpg Captain Eric Stumpf has been with the Yavapai County Sheriff’s Office since 2006.  He promoted through the ranks of Detention Services and is currently assigned to the criminal justice center being constructed on Prescott Lakes Parkway in Prescott.  He is a graduate of the National Jail Leadership Command Academy, Class #40.


Director Samantha Russell

sam headshot.jpg Samantha I. 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.  Russell 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, Russell promoted to the rank of Director overseeing the operations of the Support Services, Communications and Records Bureaus of the Administrative Services Division.  Russell 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, 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. Russell 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.

Director Kristin Greene

Sherrifs-Officers-9-16-21_-25.jpg Kristin 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’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.

Director Beya Thayer

Sherrifs-Officers-9-16-21_-131.jpg 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.