The startup raised $50 million with thanks to its artificial intelligence, which analyzes the behavior behind emails. : Abnormal Security is founded by veterans Evan Reiser (left) and Sanjay Jeyakumar (right), both veterans of the advertising technology industry. Evan Reiser and Sanjay Jeyakumar do not come from cybersecurity backgrounds. The pair linked up at TellApart, the advertising technology startup that was sold to Twitter for $479 million in the social media giant’s largest acquisition to date. After quitting Twitter in 2018, Reiser and Jeyakumar bet that their marketing mindsets could translate to the world of email security.