10 L3Harris security leaders
Michael Higgins, VP, Information Security and CISO at L3Harris Technologies, is one of ten L3Harris security leaders listed here, alongside people who hold or have held deputy CISO, product security and threat mitigation director roles at the company. A reader can learn how security leaders work at L3Harris from people who have held the role.
Professionals to explore
Daniel Gill
LinkedInExperience: CISO - L3HCA (Australia) · L3Harris Technologies
Daniel Gill has been CISO - L3HCA (Australia) at L3Harris Technologies since August 2025, based in Brisbane. Daniel Gill was Senior Cyber Security Engineer at Insitu Pacific (2023–2025), Cyber Security Engineering Team Leader at Boeing (2022–2023) and Systems Engineer - Principal Technical Professional at KBR, Inc. (2020–2022).
David Kallus
LinkedInExperience: Director, Product Security · L3Harris Technologies
David Kallus has been Director, Product Security at L3Harris Technologies since January 2023, described in the profile as cybersecurity architect for L3Harris Public Safety and Professional Communication (PSPC) products, leading the cybersecurity aspects of product development. David Kallus held Director, Cyberintelligence at L3Harris Technologies (2019–2023).
Devin McLean
LinkedInExperience: Director, Threat Mitigation · L3Harris Technologies
Devin McLean has been Director, Threat Mitigation at L3Harris Technologies since April 2025, with a profile headline of Director, L3Harris CSIRT. At L3Harris Technologies, Devin McLean also held Senior Manager, Threat Mitigation (2024–2025), Senior Manager, SOC and Threat Mitigation Infrastructure (2021–2024) and Manager, SOC (2018–2020).
Igor A. (Tony) Spivak
LinkedInExperience: Director, Defense Communications Security Engineering · L3Harris Technologies
Igor A. (Tony) Spivak has been Director, Defense Communications Security Engineering at L3Harris Technologies since April 2018, and has also held Fellow (since 2020) and Principal Fellow (since 2021) titles there. Igor A. (Tony) Spivak was Senior System Engineer at Harris Corporation (2011–2018) and Senior Principle Engineer at Harris RF Communications (1987–2011).
Kevin Gradt
LinkedInExperience: Director, Network and Security Operations · L3Harris Technologies
Kevin Gradt has been Director, Network and Security Operations at L3Harris Technologies since January 2011, a role the profile describes as responsible for managing the corporate enterprise network and security systems for L3Harris. Kevin Gradt was Program Manager/Business Development Manager at Harris Corporation (2007–2011).
Liz Shelton
LinkedInExperience: Director, IT Security Enterprise Access and Endpoint Management · L3Harris Technologies
Liz Shelton held Director, IT Security Enterprise Access and Endpoint Management at L3Harris Technologies from 2022 to 2025 and Sr. Manager Enterprise Access & Endpoint Engineering and Architecture there from 2021 to 2022. Liz Shelton has been Sr. Director, CSD Segment CIO at L3Harris Technologies since January 2026.
Mark Fenkner
LinkedInExperience: Sr. Director, Deputy CISO · L3Harris Technologies
Mark Fenkner has been Sr. Director, Deputy CISO at L3Harris Technologies since January 2020. Mark Fenkner held Director of Enterprise Cyber Security (2016–2018) and Manager of Enterprise Cyber Security & Incident Response (2011–2016) at L3 Technologies, and the profile describes managing, designing and implementing security, network and cloud solutions.
Michael Higgins
LinkedInExperience: VP, Information Security and CISO · L3Harris Technologies
Michael Higgins has been VP, Information Security and CISO at L3Harris Technologies since July 2019. At Harris Corporation, Michael Higgins held Vice President and Chief Information Security Officer (2017–2019), Director of Information Security & Chief Information Security Officer (2010–2017) and Director of Communications Assurance (2008–2010).
Michael Roberti
LinkedInExperience: Director Threat Mitigation · L3Harris Technologies
Michael Roberti was Director Threat Mitigation at L3Harris Technologies until July 2024, a director-level role the profile describes as managing 24/7 SOC and incident response teams. Michael Roberti was also Corporate Information Security Officer at Harris Corporation from 1999 to 2011, and has been Director of Discipleship at Calvary Chapel Christian Academy since 2024.
Michael Ronan
LinkedInExperience: Director, Engineering Management for Security and System Administration · L3Harris Technologies
Michael Ronan has been Director, Engineering Management for Security and System Administration at L3Harris Technologies since September 2025, with a profile headline citing cybersecurity and IT operations. Michael Ronan was Systems Engineering & Operations Manager (IT Operations Manager) at Leidos (2024–2025) and Computer Systems Architect Manager at Lockheed Martin (2021–2024).
Choose the right perspective
Pick the person whose security area is closest to your question, since security operations, product security and enterprise access roles involve different work. Check the dates on each role so you know whether the experience is current.
Questions to take into the conversation
- 01What did you focus on first when you took over your current security area, and what did you learn from it?
- 02How did you decide which security risks to address first with the team and budget you had?
- 03What have you learned from your own work about responding to and learning from security incidents?
Reaching L3Harris security leaders
How can I contact one of these L3Harris security leaders?
Pick one of the 10 people on this page and choose "Book a paid call", or describe your project to find others. You offer a fee for a 15-minute call or a written answer, Instant Expert finds the person's work email and sends the invitation, and they decide whether to accept. The list covers 1 company: L3Harris Technologies, based on profile data retrieved on October 18, 2026. Being listed here doesn't mean someone has agreed to take calls.
How much does it cost to reach L3Harris security leaders?
You choose the offer, starting at $5 per person. The offer is what the person receives, and Instant Expert's fee is added on top, so a $100 offer costs you $125. The fee is 20% of what you pay. You're charged only when the person books the call or sends the answer.
What if they don't reply?
You pay nothing. Instant Expert sends follow-up reminders, and if the person hasn't booked or answered within 7 days, the request expires and any hold on your card is released. You can invite several of the 10 people on this list at once and cap your total spend, so you pay only for the ones who accept.
Can an AI agent ask one of these L3Harris security leaders a question?
Yes. An agent with a USDC wallet on Base can ask one question without an Instant Expert account. It names the person, for example by the LinkedIn URL on this page, and pays per ask over x402 (HTTP 402). The person answers in writing or by voice note, and if nobody answers within 7 days, the payment goes back to the wallet automatically. Claude and ChatGPT can do the same through the Instant Expert connector: setup is at /docs/mcp for Claude and /docs/chatgpt for ChatGPT. x402 docs
About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot; roles marked former had ended by then. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.
Request a correction or removal