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Investigator Training

Private Investigations & Security Training

Gillespie Security and Investigations provides a variety of instruction and courses regarding private investigations, forensic science, security, executive protection, personal defense and handgun licensing/use/safety.  These courses are offered to the general public as well as to lawyers, investigation and security professionals.

Mark Gillespie is certified by the Texas Department of Public Safety Regulatory Services Division Private Security Board to award continuing education (CE) credits for Texas PSB licensees and registrants.



  • So You Want To Be A PI?
  • Finding Your Niche
  • Homicide Investigations
  • Forensic Science for the PI
  • Forensic Science for Attorneys
  • Interviewing Techniques and Affidavit Preparation
  • Handgun, LTC & CHL Training
  • Surveillance Training
  • Crime Scene Investigations
  • PSB Level III (coming)
  • PSB Level III Firearm Training (coming)
  • PSB Level IV (coming)