# Evan Reiser

> Evan Reiser is the Las Vegas-based founder and CEO of Abnormal AI, the behavioral security company he co-founded with Sanjay Jeyakumar in 2018. His route from a failed college semester and an unprofitable gaming community to ad-tech acquisitions, Twitter's machine-learning business, and a $5.1 billion cybersecurity company is a study in turning hard-earned pattern recognition into an operating discipline.

- **Role:** Founder and CEO at Abnormal AI
- **Organizations:** Abnormal AI, Twitter, TellApart, AdStack, Bloomspot, GamerNook, S&P Global, Eastman Kodak
- **Education:** BS in Computer Systems Engineering and Computer Science, Rensselaer Polytechnic Institute
- **Known for:** Co-founded Abnormal AI and grew it to more than $200 million in annual recurring revenue by 2024., Raised a $250 million Series D at a $5.1 billion valuation in August 2024, bringing announced total funding to $546 million., Built a platform that, by April 2025, protected more than 3,000 organizations, served more than 20% of the Fortune 500, and had stopped nearly $1 billion in fraud, according to Abnormal.

## Career timeline

- **2003** — Worked in research and development at Eastman Kodak on machine-learning applications.
- **2006-2007** — Worked as a software engineer in Manhattan, with Dealroom listing S&P Global.
- **2007** — Founded GamerNook, a social community for gamers; the service attracted devoted users but did not become financially sustainable.
- **2008-2010** — Co-founded Bloomspot, a luxury experiences and merchant analytics company that grew beyond 100 employees and was later acquired by JPMorgan Chase in 2012.
- **2011-2013** — Founded and led AdStack, applying behavioral data science to advertising and email personalization; TellApart acquired the company.
- **2013-2015** — Worked in product at TellApart.
- **2015-2018** — Led product management and machine-learning teams for Twitter's advertising business.
- **2018** — Co-founded Abnormal Security with Sanjay Jeyakumar to use behavioral AI against socially engineered email attacks.
- **2024** — Abnormal raised a $250 million Series D at a $5.1 billion valuation after crossing $200 million in annual recurring revenue.
- **2025** — Renamed Abnormal Security to Abnormal AI as the company expanded its behavioral security ambition across cloud applications.

## Achievements

- Co-founded Abnormal AI and grew it to more than $200 million in annual recurring revenue by 2024.
- Raised a $250 million Series D at a $5.1 billion valuation in August 2024, bringing announced total funding to $546 million.
- Built a platform that, by April 2025, protected more than 3,000 organizations, served more than 20% of the Fortune 500, and had stopped nearly $1 billion in fraud, according to Abnormal.
- Led product management and machine-learning teams in Twitter's advertising business, with responsibility connected to roughly $2 billion in annual revenue.
- Co-founded Bloomspot, acquired by JPMorgan Chase, and AdStack, acquired by TellApart.

## Latest updates

- **2026-04** — Abnormal AI announced three senior leadership appointments as it continued expanding its Behavioral AI Platform; Reiser said priorities must help the company move faster than the market.
- **2025-08** — Announced Microsoft 365 Security Posture Management, international expansion, and a group of email security platform enhancements.
- **2025-04** — Changed the company's name from Abnormal Security to Abnormal AI and set out a broader behavioral security strategy across cloud applications.
- **2024-08** — Closed a $250 million Series D at a $5.1 billion valuation after Abnormal crossed $200 million in annual recurring revenue.

## Links

- Website: https://abnormal.ai/about/team/evan-reiser
- LinkedIn: https://www.linkedin.com/in/evanreiser
- Twitter/X: https://twitter.com/evanreiser

---

Profile page: https://yespress.io/evan-reiser
Published by YesPress — https://yespress.io
Last updated: 2026-09-27