John O'Brien

About

Fix one thing. Rinse, repeat. Technical leader who believes in iterative change, with an aim to bring people together to solve the problem of the day. Broad background in the fields of Cyber Security, Software Engineering, Public Policy, and Cloud Computing, combined with the ability to confidently engage with both senior executives and technical staff.

Experience

• Microsoft (Permanent Full-time · 5 yrs 4 mos)
  • National Security Officer
    Nov 2025 - Present · 8 mos

  • Principal Security Researcher - Microsoft Threat Intelligence
    May 2025 - Present · 1 yr 2 mos

  • Principal Security Research Lead - Cloud Apps and Identity Research
    May 2024 - Nov 2025 · 1 yr 7 mos

• Head of Security at The Canadian Digital Service
  Nov 2017 - Mar 2021 · 3 yrs 5 mos

• Communications Security Establishment (Ottawa, Canada Area)
  • Senior Technical Advisor - Cyber Defence
    May 2017 - Oct 2017 · 6 mos

  • Team Lead - Malware Analysis & Automation
    May 2011 - Apr 2017 · 6 yrs

  • Senior IT Security Analyst - Cyber Defence
    May 2005 - Apr 2011 · 6 yrs

• Network Security Consultant at AEPOS Technologies
  May 2003 - Apr 2005 · 2 yrs