Our History

SIS Investigations is the industry leader in Corporate and Insurance Investigations.  With over 30 years of experience, former government investigators, and a state-of-the-art Technology Division, we can provide skilled investigative services for almost any industry.

1987 – SIS Investigations Founded
SIS Investigations was founded with the goal of providing excellent service and superior results in a timely manner.

2000 – Moved into expanded facilities
SIS enjoyed extensive growth since its founding, and in 2000 we moved into expanded facilities located in Rancho Cucamonga.

2010 – Technology Division Launched
SIS Investigations offers our investigators cutting edge technologies, tools, and resources that greatly enhance our capability and speed to provide for our clients’ needs.

2015 – Moved into Redlands
SIS enjoyed continued success since moving to Rancho Cucamonga, and in 2015 we moved into the historic downtown of Redlands.

Our Pledge:

Stewart Investigative Services, Inc. is a leader in the field of Private Investigations whose commitment to assisting in the control of Workers’ Compensation Insurance Fraud enables us to offer our clients competitive pricing in the area of surveillance and AOE/COE investigations.

We are dedicated to you and are committed to providing you with the highest quality service and results. This commitment means we will:

  • – Treat you with respect and courtesy.
  • – Conduct our business in an ethical and professional manner.
  • – Return phone calls and e-mails promptly and responds to your requests in a timely manner.
  • – Provide clients with case updates in real time.
  • – Utilize our experience to develop the best strategies in order to achieve the desired outcome on case work.
  • – Provide you with the best services possible for the price.