Evan Reiser is an American entrepreneur and technology executive, best known as the co-founder and CEO of Abnormal Security, an AI-driven email security platform. Established in 2018 and headquartered in San Francisco, Abnormal Security uses advanced machine learning to detect and prevent sophisticated email-based threats, including phishing, malware, and business email compromise. Under Reiser's leadership, the company has achieved rapid growth, securing hundreds of millions in venture capital funding from investors such as Greylock Partners, with notable backers including Asheem Chandna. Abnormal Security now serves thousands of enterprise customers globally, positioning it as a key player in the evolving cybersecurity landscape.

Prior to founding Abnormal Security, Reiser built a strong foundation in technology and security. He worked as a product manager at Dropbox, where he contributed to cloud storage and collaboration tools, and earlier at Palantir Technologies, focusing on data analytics and software engineering for complex security applications. His professional experience reflects a deep commitment to innovative software solutions, particularly in areas intersecting with data privacy and threat detection.

Reiser's educational background includes a Bachelor of Science in Computer Science from Stanford University, which provided him with the technical expertise central to his career. While details of his personal life remain relatively private, Reiser is recognized in the tech community for his forward-thinking approach to AI applications in cybersecurity, emphasizing behavioral analysis over traditional rule-based systems.