Private Investigator - 918.280.9637


Protecting Valuable Assets

For nearly twenty years The Harmon Group's managers directed security operations for Tulsa's largest city asset, the Thomas Gilcrease Museum... An asset greater than Tulsa's International Airport.

Harmon Security Group investigates a wide range of security-related concerns and issues for clients operating in eastern Oklahoma including:

Business Investigations

  • Workmans Compensation
  • Pre-employment Screening
  • Discipline & Termination Documentation
  • Key Employee background Checks
  • Employee Theft
  • Unfair Business Practices
  • Business background Checks
  • Sexual Harassment
  • Violence in the Workplace

Business Surveillance

  • Infidelity Investigation
  • Background Checks
  • Corporate Investigation
  • Process Server
  • Infidelity investigations
  • Computer and data forensics
  • Drug and alcohol testing
  • Skip tracing
  • Surveillance - on site and remote
  • Mystery shopper testing
  • GPS
  • Internal theft
  • Record research and retrieval

Private Investigtive Services

  • Surveillance
  • Skip Tracing
  • Missing Heirs
  • Domestic Infidelity
  • Child Custody Issues
  • Conservatorships
  • Suspicious Deaths
  • Locate Missing Children/Parents
  • Wrongful Deaths
  • Missing Persons
  • Witness Locates & Interviews
  • Personal Injury
  • ID of Assets
  • Civil & Criminal Issues
  • Contract Disputes
  • Background Checks
  • Probate Matters
  • Divorce Actions

We are members of ASIS and OPIA (Oklahoma Private Investigators Association) CLEET

Company Information


Our corporate office is located on the 11th floor of the historic 320 South Boston Building, downtown Tulsa, where we provide on-site guard services for the premises in addition to six high-rise commercial facilities in the down-town area. Additionally, Harmon Security Group LLC. manages security for many large commercial and industrial facilities. (HSG) was incorporated in January of 2007 to manage security services for major facilities in eastern Oklahoma. HSG is recommended by ASIS and has an A rating with the BBB.

Company History

Roger A. Harmon was President and founder of Harmon Security Group LLC., he is currently retired. Roger is now a consultant for the Harmon Group. Mr. Harmon has vast experience in the security industry, he began his police career more than forty years ago, after a successful tour in the Vietnam War. Utilizing specialized explosives training received while in the U.S. army, Roger was a founding member of the Tulsa Police Department's bomb disposal unit, his experience ranges from explosive mitigation to white collar crime and homicide investigation. Roger Harmon retired from the Tulsa Police Department in 1990 and served as the Director of Security for the Thomas Gilcrease Museum for 19 years. Roger is a graduate of Red Stone Arsenal and the FBI's white-collar crime academy, and he is a CPP (Certified Protection Professional, certification via ASIS (American Society for Industrial Security).