After being honorably discharged from the United States Air Force, Mark began a career with the California Department of Corrections. He started as an officer at the California Rehabilitation Center in Norco, California. After 10 years of service, he was promoted to Sergeant and transferred to California Institution for Men, in Chino, California. He then promoted to Lieutenant and became the Public Information Officer and Assistant to the Warden. In 2010, Mark was awarded the Distinguished Service Medal of Valor. After 30 years of service, he retired with aspirations of serving the City of Chino.