Matthew K. Olsen During his 17 years as a Deputy District Attorney in Marin County California, Sean has held a variety of assignments ranging from prosecuting DUIs to overseeing the Major Narcotics Unit. Sean currently leads the Insurance Fraud Unit which is charged with the investigation and prosecution of all cases involving automobile and workers’ compensation fraud. He is a member of the Golden Gate Workers’ Compensation Fraud Consortium and serves as an instructor on search warrants at the California Department of Insurance’s Basic Investigators Course.