Agency Profile

Since our founding in 1980, Kelsay Investigations has consistently provided the highest quality of service for a variety of investigative and legal matters.  Serving San Diego, Imperial, Riverside, and Orange counties, we are appropriately sized to professionally handle all types of cases while maintaining optimal communication with our clients.

We are experts in supporting general civil litigation and in uncovering insurance fraud.  In fact, our fraud-disclosure services have proven themselves a core competency and foundation of our business.  However, as a full service investigative agency, we do cater to a wide variety of cases and clients outside of the insurance industry including domestic and business cases.

Clients of our agency that regularly retain our services include large national and statewide insurance companies, law firms, and local area self-insured organizations.  Those clients are comprised of or represent families and individuals, small-business owners, major commercial retailers, and a wide range of public organizations.

Marshall Kelsay - Owner/Manager

Marshall Kelsay joined the San Diego County Sheriff’s Department in 1969, serving as a Deputy Sheriff in the patrol, traffic, civil and canine divisions. In 1974 he was assigned as an investigator to the Office of Special Investigations where he worked in an undercover capacity in the areas of organized crime, homicide, major fraud, terrorists and subversive organizations; and, extraditions of major felons throughout the United States.

He graduated from National University in 1978 with a Bachelor of Public Administration degree in Criminal Justice and a Master of Public Administration degree in 1979.

In 1980 he was assigned to the personnel unit of the San Diego County Sheriff’s Department, wherein his duties included background and pre-trial investigations. He became licensed by the State of California as a private investigator on May 23, 1980 and founded Kelsay Investigations. He was honorably retired from the San Diego County Sheriff’s Department on December 31, 1981 and became the in-house investigator for the prestigious law firm of McInnis, Fitzgerald, Rees, Sharkey & McIntyre, where he was in charge of all pre-trial investigations involving general civil litigation matters until April 1985.  Since that time, he has owned and managed Kelsay Investigations.

Matthew Kelsay – Partner/Lead Investigator

Matthew began working as an investigator with Kelsay Investigations in 2002.  With the goal of attaining his own license and a future ownership role with Kelsay Investigations, he dedicated himself to fulfill the California experience and training requirement from 2002 to 2010.  During that eight year period, he was simultaneously employed by several investigative agencies throughout the state of California in an effort to receive the most diverse and advantageous training and experience possible.  Among the investigators that he conducted investigative assignments with during his training were former FBI, Secret Service, and local law enforcement agents.

He graduated from California State University, San Marcos in 2007 with a Bachelor of Arts in Sociology, emphasis in Criminal Justice.  In 2010, he qualified for and passed the State of California licensing exam for his Private Investigator’s license with the Bureau of Security and Investigative Services.  Since 2010, he has continued his professional education by receiving training and certification in Sporting Event Security, Personal Protection Services, and Technical Surveillance Counter Measures.

Matthew has appeared before the San Diego Superior Court, JAMS California, and the San Diego and Santa Ana Workers’ Compensation Appeals Board.  During those appearances he testified on matters involving personal injury litigation, child custody, workers’ compensation claim defense, and criminal prosecution for insurance fraud.