Abnormal Security

Brief Overview

Abnormal Security provides a cloud email security platform that protects enterprises from targeted email attacks. It models an individual employee’s identity and analyzes communication behavior and email content to stop attacks that lead to account takeover, financial damage and organizational mistrust.


797 Bryant Street
San Francisco, California, 94107


CEO: Evan Reiser
CTO: Sanjay Jeyakumar
Head of Machine Learning: Jeshua Bratman
Founding Engineers: Abhijit Bagri and Dmitry Chechik


Abnormal Security was founded in 2018 by CEO Evan Reiser, CTO Sanjay Jeyakumar, Head of Machine Learning Jeshua Bratman, and Founding Engineers Abhijit Bagri and Dmitry Chechik. The team previously built behavioral profiling and machine learning technologies at Twitter, Google and Pinterest that are being applied to solve a problem that costs organizations $1 billion per year, according to the FBI. Abnormal Security is headquartered in San Francisco, CA and backed by Greylock Partners.

Products and Services

Abnormal Security provides a number of solutions aimed at detecting and stopping spear phishing, Business Email Compromise, Email Account Compromise, and dozens of other targeted attacks:
- Abnormal uses multiple data sources to confirm the identity of both the sender and receiver, building business-relevant profiles for senders and recipients.
- Behavioral Analysis baselines the organization’s communication patterns to understand individual / organizational behavior and emails in business context.
- Content Analysis engine reviews each message to identify topics, subjects, tone and sentiment. Employee and vendor references are also considered.