While serving as Director of Safety for the Southwest Region at Cal Portland, Marsh was responsible for the health and safety at 25 locations within Arizona and Southern California. He maintained relationships with managers, supervisors and employees to ensure compliance with all company, local, state and federal safety and health regulations. Marsh also oversaw two safety managers ensuring compliance with Mine Safety and Health Administration, Occupational Health and Safety Administration and Department of Transportation standards for operation.

Marsh is active in both industry and community organizations and as a member of the U.S. Marine Corps Reserve from June 1990 to June 1997. In 2015, he was awarded both the Arizona State Mine Inspector's Office Safety Professional of the Year Award and the Arizona Mining Associations Copper Pot Award. Marsh was born and raised in the Phoenix area. Aside from military service, he has always resided in the Phoenix area.