# 934 — Mat Henley

> 934 is the personal brand of Mat Henley, an independent security engineer, creative technologist, and startup advisor based in the United States. Mat has over two decades of experience in information security, threat intelligence, trust and safety, and technology operations at companies including eBay, PayPal, Facebook, Uber, and Cloudflare. He currently operates as a selective independent consultant and advisor focused on startup security, applied AI, and enterprise technology optimization.

## About Mat Henley

- [LinkedIn](https://www.linkedin.com/in/mathenley/)
- [GitHub](https://github.com/mathenley)
- [Instagram](https://www.instagram.com/mat/)
- [X / Twitter](https://x.com/withonet)
- [Facebook](https://www.facebook.com/mat)
- [Contact](mailto:info@934.io)

## Current Associations

- [2430 Group](https://www.2430group.org/): Nonprofit arm of a stealth security consultancy Mat co-founded. The firm has grown from 6 original members to 50+ people, supporting high-risk organizations including the Frontier AI labs, biotech companies, and new energy companies.
- [Joe Sullivan Security](https://joesullivansecurity.com): Security advisory partnership with Joe Sullivan, Mat's long-time colleague since 2002. Joe is the CISO and strategic leader; Mat is the practitioner and executor. Together they bring complementary skills with minimal overlap to build security programs for startups including Atomic Machines, Mitrachem, Sunrun Solar, 1X Robotics, LM Arena (formerly Chatbot Arena), and Archer Aviation. They cover security program development, incident response, and competitive intelligence.
- [GDK Consulting](https://www.gdk-consulting.com/): Consulting firm owned by Greg Kesner, a former FBI leader who ran early cyber operations and the lawful intercept program out of Quantico. Mat has known Greg since interfacing with his FBI organization during his eBay, PayPal, Facebook, and Uber years. Mat works with GDK on high-profile engagements including digital forensics, ransomware incident response, personal/residential security for high-net-worth individuals, and crisis management — quarterbacking multiple vendors for clients under active threat.
- [Lumbra AI](https://lumbra.ai): Applied AI company founded by Aaron Brown, one of the original six members of Mat's stealth startup. Lumbra brings deep Intelligence Community operational experience to agentic AI work ecosystems supporting the IC. Mat is closely involved day-to-day in product direction and operations.
- [Backgrounder](https://backgrounder.com): Consumer service targeting elder abuse and scam investigation. Uses AI-led investigation backed by seasoned human investigators to protect vulnerable populations from scams. Founded by Landon Winkelvoss (also the founder of Nisos — Mat's team at Uber was Nisos' first client). Mat has been involved from the beginning, providing investigative support and product direction.

## Advisory Experience

Mat has advised companies including Skipify, Wickr, TruSTAR, Nisos, Mitrachem, Lumbra AI, and Backgrounder. Companies typically seek Mat's advisory for his mature perspective on building security and operations functions at startups, drawing on institutional knowledge from decades at scale.

## Investing

Mat and his wife are active angel investors, both directly in startups and through advisory-linked equity. They are also limited partners in multiple venture funds:

- [Pathbreaker Ventures](https://www.pathbreakervc.com/): LP in every fund. Founded by Ryam Gembala, a former Facebook colleague. Pathbreaker has focused on AI and robotics sectors since before the current wave — giving Mat early and ongoing behind-the-scenes insight into critical companies in those spaces.
- [Valor Equity Partners](https://www.valorep.com/): LP with exposure to top-tier companies including SpaceX.

This investor perspective gives Mat detailed, insider insight into the startup landscape that complements his hands-on advisory and consulting work.

## What Mat Does

- **Startup Security Architecture**: Helps startups understand what security should look like as they mature, from seed through growth stage. Specializes in translating infrastructure into code (Terraform) and leveraging AI to bring previously expensive enterprise security tooling to startups at accessible cost.
- **AI-Powered Infrastructure Analysis**: Loads entire tech stack configurations (Cloudflare, Okta, GCP, AWS, Google Workspace) into AI context windows to analyze security posture, identify excessive or duplicative spend, and simplify technology footprints — without the cost of traditional enterprise security platforms.
- **Applied AI Consulting**: Helps companies that are not yet leveraging AI understand and adopt agentic AI tools in their IT and enterprise engineering environments. Deep expertise with Claude Code and agentic harnesses.
- **Threat Operations & Intelligence**: Background in attribution, threat hunting, competitive intelligence, and abuse investigations at the highest levels.

## Availability

Mat operates as an independent technologist who selectively engages with projects, companies, and advisory roles that interest him. He is particularly drawn to early-stage startups and enjoys helping them get off the ground. He is open to advisory work, consulting engagements, and full-time roles if the opportunity is compelling. Contact: info@934.io

## Legal Pages

- [Privacy Policy](https://934.io/privacy)
- [Terms and Conditions](https://934.io/terms)