Our Company

"Where Your Security is Our Goal"

GSI Services has been in the business of supplying investigative services since 1986. During that time, we are proud to have developed an excellent reputation both locally and throughout the state of Missouri, with specialized Investigative  services. Our company was founded in Sedalia, Missouri and has evolved into a modern and highly effective investigative company serving an array of clientele including major industrial facilities, government entities, attorneys, hospitals, shopping centers, community colleges, parks departments, homeowner associations, office complexes, department stores, hotel chains, construction sites and fast food franchises.

We proudly provide extensive Investigative services to both companies and individuals needing assistance from a reputable and reliable company. A wide range of services are available for any situation. Our staff of experienced and credible investigators are equipped with the knowledge and know-how to ensure a comprehensive and precise investigation with evidence and documentation you can bank on! Additionally, GSI Services’ commitment to swift, reliable private process service has earned our company state awarded process service contracts for 52 counties throughout Missouri. With over 40 state certified private process servers, you can count on GSI Services for all your private process service needs.

EMPLOYMENT OPPORTUNITIES: Skilled and professional individuals interested in the Investigative field or Process Serving may inquire of employment opportunities by phoning our office at (660) 826-4538 or email your resume to hr@gsiservices.biz.

To submit employment information please complete our online response form.

GSI Services–BIG enough to serve you–small ENOUGH TO CARE
  • Member (ASIS) American Society for Industrial Security
  • Member (NCISS) National Council of Investigation & Security Services
  • Member Missouri Sheriff's Association
  • Member Mo Police Chief's Association
  • Member Mo Peace Officers Association