# Jack Naglieri

> Jack Naglieri is the founder and CEO of Panther, a cloud-native SIEM platform that achieved unicorn status in 2021 with a $1.4B valuation. A former security engineer at Yahoo and Airbnb, he open-sourced StreamAlert in 2017 and parlayed that practitioner frustration into a $140M-funded company serving enterprises like Coinbase and Docker. He also writes Detection at Scale, a widely read Substack newsletter covering AI's transformation of security operations.

- **Role:** Founder & CEO at Panther
- **Organizations:** Panther, Detection at Scale (Substack newsletter)
- **Nationality:** American
- **Education:** Bachelor of Science in Applied Information Technology, George Mason University
- **Known for:** Founded Panther, a cloud-native SIEM unicorn valued at $1.4B (2021), Raised $140M in total venture funding for Panther (Series A + Series B), Open-sourced StreamAlert in 2017 - a serverless real-time intrusion detection engine widely adopted across high-tech companies

## Career timeline

- **2012-2014** — Security Analyst / Incident Responder at Verisign
- **2014-2016** — Security Engineer / Incident Responder at Yahoo (Yahoo Paranoids team)
- **2016-2018** — Security Engineering Manager at Airbnb CSIRT; open-sourced StreamAlert in 2017
- **2017** — Presented StreamAlert at USENIX Enigma conference
- **2018** — Founded Panther to build a cloud-native SIEM platform
- **2020** — Panther raises Series A led by Lightspeed Venture Partners
- **2021** — Panther raises $120M Series B at $1.4B valuation, achieving unicorn status (led by Coatue, with ICONIQ Growth, Snowflake Ventures)
- **2022** — Panther named IA40 Award Winner; begins angel investing in runZero, Fleet DM, ConductorOne, Tromzo
- **2024** — Launches Detection at Scale Substack newsletter and podcast
- **2025-2026** — Continues writing Detection at Scale, focusing on AI agents reshaping SIEM and security operations

## Achievements

- Founded Panther, a cloud-native SIEM unicorn valued at $1.4B (2021)
- Raised $140M in total venture funding for Panther (Series A + Series B)
- Open-sourced StreamAlert in 2017 - a serverless real-time intrusion detection engine widely adopted across high-tech companies
- Presented at USENIX Enigma 2017
- Panther named 2022 IA40 Award Winner
- Built platform processing petabytes of security data monthly for enterprises including Coinbase and Docker
- Angel investor in runZero, Fleet DM, ConductorOne, Tromzo
- Publishes Detection at Scale - a leading newsletter on AI-driven security operations

## Latest updates

- **2026-04** — Published 'Agents That Don't Wait for Rules to Fire' in Detection at Scale newsletter, exploring continuous agent-based threat hunting
- **2025-12** — Published '2025 Wrapped: Essential Reading on AI in Security Operations' summarizing the year AI agents went from experiments to operational realities in SOCs
- **2025-12** — Published 'The State of AI in Security Operations: 5 Patterns That Defined 2025'
- **2025** — Detection at Scale newsletter and podcast continues growing as a key resource for detection engineers and SOC leaders

## Links

- Website: https://www.detectionatscale.com
- LinkedIn: https://www.linkedin.com/in/jacknaglieri
- Twitter/X: https://x.com/jack_naglieri
- GitHub: https://github.com/jacknagz

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Profile page: https://yespress.io/jack-naglieri
Published by YesPress — https://yespress.io
Last updated: 2026-04-21