Meet the Command Staff

Colonel Temetris “Pete” Atkins


Colonel Temetris Atkins is a law enforcement professional with more than 30 years of faithful service to the Cobb County community.

After completing East Atlanta High School, he enrolled in the University of West Georgia where he attained a Bachelor’s Degree in Criminal Justice. Upon graduation, Atkins joined the Fulton County Sheriff’s Office as a Deputy Sheriff in 1988.

In 1990, Colonel Atkins joined the Cobb County Sheriff’s Office as a deputy sheriff. During his tenure with the Cobb County Sheriff’s Office, he has proven to be a valuable employee and has been assigned to multiple divisions throughout the Sheriff Office to include the Adult Detention Center, Courts, Uniform Field Operations, and MCS (Marietta-Cobb-Smyrna undercover Narcotics Unit).

Colonel Atkins was the first  African American supervisor within the Cobb County Sheriff’s Office when he was promoted to the rank of Sergeant in 1994. He has been promoted to every rank within the Sheriff’s Office starting from sergeant, to lieutenant, to major, to lieutenant colonel, to being most recently appointed to colonel and division commander of the Cobb County Adult Detention Facility by Sheriff Craig D. Owens.

Atkins is married to Kimberly Atkins his wife of over 19 years and has 3 children and resides in Decatur Georgia. He enjoys spending time with his family and is an avid movie watcher.

Lieutenant Colonel Rebekah “Becky” Westenberger

Lieutenant Colonel Rebekah Westenberger began her career with Cobb County Sheriff’s in May 1997. During this time Lieutenant Colonel Westenberger was assigned to various areas, through the ranks, including the Adult Detention Courts, Courts, Inspectional Services, Operations, Public Outreach, Recruiting, and Training. In August 2019, Westenberger was appointed to lieutenant colonel assigned to the Adult Detention Center. She also leads the Sheriff’s Office Color Guard. Westenberger is a graduate of South Cobb High School. She received her BA in Criminal Justice Administration, graduating Cum Laude, from Columbia Southern University. She is involved with Special Olympics Georgia, the Metropolitan Atlanta Police Emerald Society as well as her church, First Baptist Church of Atlanta. Lieutenant Colonel Westenberger currently resides in Powder Springs.

Colonel David Gallmon

Colonel David Gallmon began his law enforcement career in 1991 as a Cobb County police officer, working his way up to the rank of captain. He was previously the Precincts 2 and 5 commander. Over the course of his career, Gallmon handled critical incidents to include SWAT, hostage negotiations, and suspected bomb threats. Gallmon served in the United States Air Force with assignments that included Ballistic Analysis Technician for the Titian II nuclear weapon system and Air Traffic Controller. After leaving active duty, he went on to serve in the United States Air Force Reserves until 2003. Gallmon received a Bachelor of Science degree in Aeronautics from Embry Riddle Aeronautical University and a Master’s Degree in Public Administration from Command College, Columbus State University.

Lieutenant Colonel Dewayne Morris


Lieutenant Colonel Dewayne Morris began his law enforcement career at the Powder Springs Police Department and then went on to join the Cobb County Police Department achieving the rank of sergeant.

He has previously worked as an explosives expert for the Georgia Bureau of Alcohol, Tobacco, and Firearms. Morris has also been a peace officer for the Cobb County Board of Education.

Lieutenant Colonel Dewayne Morris joined Sheriff Owens’ administration and oversees a number of administrative functions.

Colonel Nathanial “Nat” Nation

Colonel Nathanial Nation has been employed with the Sheriff’s Office since 1994. As a deputy, Nation worked in the Court Security, Detention Division, Fugitive, Uniform Field Operations, and was assigned to SWAT in 1995. While working Fugitive, Nation was promoted to the rank of sergeant in 2002 and worked in the Detention Division, Uniformed Field Operations, and SWAT. While in Uniform Field Operations, Nation was promoted to the rank of lieutenant in 2009 and served in the Detention Division, Sheriff’s Office Training Unit, and SWAT. He was then promoted to the rank of major in 2014 and served in Uniform Field Operations as a watch commander and SWAT. In September 2016, Nation was appointed to the rank of Lt. Commander and served as the Assistant Division Commander of the Uniform Field Operations Division. In 2018, he was assigned the rank of commander and oversees the Uniform Field Operations Division and commander of the Sheriff’s Office SWAT Team. In January 2019 he was promoted to the rank of colonel and is currently the Uniform Field Operations Division Commander. Colonel Nation grew up in Blairsville, GA and graduated from Union County High School. He earned his Bachelor of Science in Criminal Justice from North Georgia College in Dahlonega in 1993.

Lieutenant Colonel Ryan Mehling


Lieutenant Colonel Ryan Mehling has been employed with the  Sheriff’s Office since 2000. As a deputy, Mehling worked in the Detention Division, Domestic Violence Unit, Forgery Unit, Transport Unit, and Uniform Field Operations.

While working Forgery, Mehling was promoted to the rank of sergeant in 2007 and subsequently promoted to the rank of lieutenant in 2013, and major in 2016. He has also served in the Criminal Investigations Unit and in Internal Affairs.

In September of 2019, Mehling was appointed to the rank of commander and serves as the assistant division commander of the Uniform Field Operations Division.

Commander Mehling graduated from Kennesaw State University in 2000 where he earned his Bachelor of Science in Psychology. He is married with one child and attends St. Ann’s Catholic Church in Marietta.

Colonel Eric Yeager

Colonel Eric Yeager is a career law enforcement professional, having joined the Cobb County Police Department in 1988. He served for 32 years, working in numerous departments across the agency including the Fatality Investigations Unit, the Criminal Investigations Unit Commander and the Special Victims/Crimes Against Children Unit Commander before retiring in 2020 as the Assistant Commander in Precinct 2. Colonel Yeager joined the Cobb County Sheriff’s Office in January 2021 and leads the Criminal Investigations Division which encompasses Crime Scene Investigations, Domestic Violence Unit, Evidence Unit, Forgery and Fraud Unit, Fugitive Unit, Marietta/Cobb/Smyrna Narcotics Unit, and Sex Offender Unit. He is a graduate of Fairmont State University. He has completed numerous supervisory programs including the Government Management Development Program from the University of Georgia’s Carl Vinson Institute. He is married with three children and resides in Cobb County.

Lieutentant Colonel Clifford Kelker

Lieutenant Colonel Clifford Kelker began his law enforcement career with the Marietta Police Department in Marietta, Georgia in 1991. He went on to become the chief of police in Jonesboro, GA in 2018. A military veteran, he served over seven years in the United States Army and deployed with the 101st Airborne Division to Operation Desert Shield and Operation Desert Storm. Kelker joined the Cobb County Sheriff’s Office in 2021, where he leads the Criminal Investigations Division. Kelker earned a Bachelor’s Degree in Public and Social Services and a Master’s Degree in Public Administration from Kennesaw State University. He has completed several executive management training courses to include being a graduate of the 55th Session of the Senior Management Institute for Police (SMIP) at Boston University and the 106th Session of the Administrative Officers Course at the Southern Police Institute on the campus of the University of Louisville. He also completed the Carl Vinson Institute of Governance-Management Development Program, the International Association of Chiefs of Police-Leadership in Police Organizations course and is a graduate of the Dale Carnegie Leadership course receiving the highest award.

Lieutenant Colonel Arthur Peralta

Lieutenant Colonel Arthur Peralta began his law enforcement career in 1982 as a Law Enforcement Specialist in the United States Air Force. After serving ten years of active duty service, he joined the Santa Fe Police Department in Santa Fe, New Mexico. He served as a Patrol Officer, Juvenile Services Commander and, upon being promoted to Lieutenant, the Accreditation Manager. Lt. Colonel Peralta joined the Bureau of Alcohol, Tobacco, Firearms and Explosives and served twenty years stationed in California, Washington D.C., Texas, and Georgia. He most recently served as the Special Agent in Charge, overseeing all ATF operations in the State of Georgia. Lt. Colonel Peralta holds a Bachelor’s Degree in Human Services from Wayland Baptist University, Plainview, Texas and a Masters Degree in Security and Safety Leadership from George Washington University, Washington D.C.