Texas License: A-11847 | Louisiana License: 7311-011910-LA

Alabama License: 395 | Tennessee License: 8510

About Mark

Meet Mark Gillespie

  • Owner of Gillespie Forensics & Investigations
    • 2004 – Present
  • Court-Appointed Investigator (indigent defense) with Travis County (TX) Capital Area Private Defender Service (CAPDS) (Indigent Defense) 
    • 2015 – Present
  • Adjunct Professor, University of North Texas (UNT), Professional Development Institute (PDI), Private Investigator Certificate program 
    • 2014 – 2017
  • Professor of Forensic Science and Criminal Justice, St. Edwards University (SEU), Austin, TX. Helped establish Forensic Science Undergraduate Degree Program.
    • 2002 – 2009
  • Director of Forensic Science Division, Austin Police Department. Managed forensic science services provided to the City of Austin. Created all civilian crime scene unit, established DNA Laboratory, helped draft Texas Senate Bill 638 (Collection of DNA Upon Arrest, Indictment or Conviction, 2001), responsible for funding and construction of state-of-the-art forensic science center.
    • 1996 - 2002
  • Special Agent/USAF Officer, Air Force Office of Special Investigations (AFOSI). Commanded investigative units in the US and overseas. Conducted, supervised and managed felony investigations (crimes against people, property, counterintelligence and counterespionage investigations).
    • 1979-1996


  • BS, Computer Science, Troy State University, 1979
  • Master of Forensic Science (MFS), George Washington University, 1983

PI Licenses

  • Texas
  • Alabama
  • Louisiana
  • Tennessee

Professional Associations

  • Texas Association of Licensed Investigators (TALI)
    • Past President and Board Member 
    • School Director
  • National Council of Investigation and Security Services (NCISS)
    • Secretary
    • Past Region 4 Director
  • National Association for Missing and Exploited Children
    • Co-Founder and Chairman of the Board
  • Association of Former OSI Special Agents
  • National Association of Licensed Investigators (NALI)
  • INTELLENET, International Intelligence Network
  • Council of International Investigators
  • National Association of Investigative Specialists (NAIS)
  • Florida Association of Licensed Investigators (FALI)
  • Florida Association of Private Investigators
  • Alabama Private Investigators Association
  • Louisiana Private Investigators Association
  • California Association of Licensed Investigators (CALI)
  • Association of Christian Investigators
  • Council of Association Leaders (COAL)
  • National Defense Investigator Association
  • National Association for Public Defense
  • National Legal Aid & Defender Association
  • National Association of Criminal Defense Lawyers
  • Texas Criminal Defense Lawyers Association

Send email to mark@gillespieinvestigations.com.  

A Word from Our Clients

Contact Us

2501 South Bagdad RD., Suite B,
Leander, TX 78641