Abnormal Security
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Leadership History
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Abnormal Security Corporation is widely celebrated as one of the most innovative and rapidly compounding enterprise cybersecurity companies in modern history. Founded in 2018 by machine learning pioneers Evan Reiser and Sanjay Jeyakumar—who previously led ad-targeting and machine learning infrastructure at Twitter—Abnormal was born out of a realization that corporate cybersecurity was fighting the wrong war. For over two decades, the email security industry had relied on Secure Email Gateways (SEGs) like Proofpoint and Mimecast. Gateways operated like airport security checkpoints: they inspected incoming messages for known malware attachments, blacklisted IP addresses, and malicious URL links. However, cybercriminals had shifted to socially engineered Business Email Compromise (BEC): impersonating CEOs, spoofing vendors, and requesting fraudulent wire transfers using pure plain text. Because these attacks contained zero malicious code, legacy gateways let them through completely undetected, costing global businesses over $50 billion. Reiser and Jeyakumar recognized that stopping social engineering required understanding human behavior. By integrating natively into cloud mailboxes via APIs and training deep neural networks on corporate communication graphs, Abnormal invented behavioral email security, protecting over 15% of the Fortune 500. Today, Abnormal Security stands as one of the most technologically revered, commercially formidable, and essential cybersecurity companies of the cloud computing era. By proving that human behavioral modeling can defeat socially engineered deception, Abnormal has established a permanent legacy in enterprise cybersecurity, safeguarding global commerce against modern digital extortion.
Abnormal Security operates a pure B2B enterprise SaaS subscription model billed on an annual per-user/inbox basis: Inbound Email Protection (detecting BEC, executive impersonation, phishing); Account Takeover Protection (monitoring sign-in telemetry and cloud account compromise across Microsoft 365, Google Workspace, and identity providers); Vendor Supply Chain Risk (profiling vendor invoicing and detecting compromised supplier accounts); and Abuse Mailbox Automation (auto-triaging employee-reported phishing emails), generating strong multi-product enterprise contract expansion.
Abnormal Security navigates intense competition from legacy Secure Email Gateway giants (Proofpoint, Mimecast, Cisco IronPort) and native cloud security from Microsoft (Microsoft Defender for Office 365), while scaling machine learning models to process hundreds of millions of daily emails with zero false positives.
Beyond competitive pressures from legacy gateway conglomerates attempting to modernize their cloud offerings, Abnormal must continually anticipate and counter rapidly evolving offensive generative AI techniques employed by international cybercrime syndicates, while maintaining seamless, low-latency API coordination with hyperscale cloud mail providers.
Evan Reiser currently leads Abnormal Security, overseeing strategic vision, balance sheet health, and organizational execution in Cybersecurity, AI Email Security, Cloud Security, Behavioral AI, Business Email Compromise (BEC) & Threat Detection.
Under executive direction, Abnormal Security is prioritizing workflow automation alongside disciplined capital allocation to maximize shareholder value.
Leadership at Abnormal Security has historically navigated industry cycles by restructuring operational priorities and expanding competitive moats.