• Home
  • About Us
  • Our Services
  • Our Team
  • Contact Us
  • More
    • Home
    • About Us
    • Our Services
    • Our Team
    • Contact Us
  • Home
  • About Us
  • Our Services
  • Our Team
  • Contact Us

Onset Investigation

Brett Robinson - President & Founder

Kostas Mavromatis - VP of Operations

Brett Robinson - President & Founder

Brett Robinson founded Onset Investigation with the vision of assisting law enforcement globally after he had uncovered evidence in over 70 cases involving wanted criminals and missing persons across Canada. He has helped close 35 cases over six years. As one of Canada’s most experienced private investigators, he regularly meets with detectives to assist with case development. He has an MA in Profiling and Analysis and an MA in Counselling Psychology.

Dr. Michael Andrew Arntfield

Kostas Mavromatis - VP of Operations

Brett Robinson - President & Founder

Dr. Michael Arntfield is a police detective-turned university professor and homicide scholar at Western University, where he also founded the Cold Case Society—a think tank that pairs students with historical homicides and missing persons cases to crowdsource and use AI to develop new leads. He is also a Director with the Murder Accountability Project in Washington, DC, a not-for-profit NGO which similarly uses AI algorithms to detect serial killer patterns in large homicide data sets. The author of a soon-to-be 14 books on criminal investigation and forensics, he has also appeared as host and/or expert on violent crime in over 35 collective seasons of true crime and documentary television and streaming series. He is also a Fulbright Scholar as designated by the US State Department and a well-known TED speaker.


Website:

michaelarntfield.com 


TED Talk: https://www.ted.com/talks/michael_arntfield_how_you_can_help_solve_cold_cases

Kostas Mavromatis - VP of Operations

Kostas Mavromatis - VP of Operations

Kostas Mavromatis - VP of Operations

Regarded as one of the premier forensic archival researchers in Canada, Kostas Mavromatis has spent the past four years assisting cold case squads around the country with their case development. He holds an Honours BA in History and previously served as the Senior Associate Researcher and Archivist at a charity focused on locating missing persons.


Investigation Team

Kostas Mavromatis - VP of Operations

Kostas Mavromatis - VP of Operations

The members of our Investigation Team are unable to share their identities due to the sensitive nature of their cases. They come from backgrounds in law enforcement, fraud prevention, open-source intelligence, and academia. They are specialists in locating missing persons and wanted criminals, liaising with international police, and facilitating extradition requests.

Copyright © 2025 Onset Investigations - All Rights Reserved.

Powered by

This website uses cookies.

We use cookies to analyze website traffic and optimize your website experience. By accepting our use of cookies, your data will be aggregated with all other user data.

Accept