John Wickum, Deputy Chief

John Wickum was raised in the city of Rancho Cucamonga and has been a lifelong resident of San Bernardino County. John became interested in law enforcement at a young age, joining the Sheriff’s Explorer program at Rancho Station in 1985. John began his career with the San Bernardino County Sheriff’s Department in 1991, graduating from the Frank Bland Regional Training Academy class #103.

John has worked various assignments during his career, including Central Detention Center, Foothill Detention Center, West Valley Detention Center, Victor Valley Station, Narcotics Division, Specialized Enforcement Division, Apple Valley Station, High Desert Detention Center, and most recently the Captain for the Victorville City Station.

John holds numerous certificates from the California Commission on Peace Officer Standards and Training. He attended Chaffey College and California Coast University, Irvine. He is a member of many law enforcement organizations, serving on the San Bernardino County Sheriff’s Rodeo board and he is currently the Liaison for the Sheriff’s Rangers.

Sheriff Shannon Dicus promoted John to Deputy Chief in March 2024. John is currently assigned to the Detention and Corrections Operations Bureau.

James Mahan, Deputy Chief

Bio coming soon.

Randy German, Deputy Chief

Bio coming soon.

Jeremy Martinez, Deputy Chief

Jeremy began his career with the San Bernardino County Sheriff’s Department in 1998, graduating from the Frank Bland Regional Training Center, Academy Class 134. Jeremy has worked various assignments during his career, including the West Valley Detention Center, High Desert Detention Center, Barstow, Apple Valley, Victorville, Hesperia, and Victor Valley Patrol Stations, Gangs and Narcotics, Inland Regional Narcotics Enforcement Team, and the Employee Resources Division.

Jeremy received a bachelor’s degree in criminal justice from Cal State University San Bernardino, holds numerous certificates from the California Commission on Peace Officer Standards and Training, and is a member of several law enforcement associations.

Jeremy was promoted to Deputy Chief in April of 2024 by Sheriff Shannon Dicus and oversees the Special Operations Bureau.

Robert Trostle, Deputy Chief

Bio coming soon.

Garth Goodell, Deputy Chief

Garth Goodell began his career with the San Bernardino County Sheriff’s Department in 1993 as a reserve deputy sheriff. He was hired full time in 1995 and attended the 120^th session of the Sheriff’s Basic Academy.

Garth’s law enforcement career began with his first custody assignment at West Valley Detention Center. He was later assigned to patrol operations at Morongo Basin, Chino Hills Station and Gangs / Narcotics. As a detective, he was assigned to Hesperia Station and the Specialized Enforcement Division. As a sergeant, Garth was assigned to Twin Peaks Station and Chino Hills Station. Following his promotion to lieutenant, Garth was assigned as the commander of the Centralized Classification Unit and later as the lieutenant for the Specialized Enforcement Division. As a captain, Garth has held command assignments at Employee Resources Division and Chino Hills Station.

Garth earned his Bachelor of Science degree in Criminal Justice Management from Union Institute and University and his Master of Business Administration from California Baptist University. He holds numerous professional certificates and memberships and is also a graduate of the FBI-LEEDA Leadership Trilogy and the California Police Chiefs Executive Leadership Institute at Drucker School of Management.

Sheriff Shannon Dicus promoted Garth to Deputy Chief in July 2023. As Deputy Chief, Garth is responsible for the Personnel and Emergency Services Bureau.

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