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Tessian is a cybersecurity company that pioneered Human Layer Security. It leverages machine learning to understand human behavior and protect enterprises from threats initiated by people, such as spear phishing, accidental data loss via misdirected emails or misattached files, and insider threats. Acquired by Proofpoint in late 2023, Tessian's technology aims to automatically prevent security incidents by securing the human layer, turning employees from a potential vulnerability into a strong line of defense.
Serves as a key operational hub, historically housing leadership, engineering, product development, and core business functions. Post-acquisition by Proofpoint, it continues to be a center for Human Layer Security innovation and talent.
Located in the redeveloped 3 Finsbury Avenue building within the Broadgate campus, a major business and tech hub. The office likely features modern, agile workspaces designed for collaboration and technological innovation, with access to campus amenities.
Tessian historically cultivated a dynamic and mission-driven work culture focused on innovation in cybersecurity. The London HQ embodied a collaborative, fast-paced environment encouraging continuous learning and problem-solving, typical of successful tech scale-ups in the competitive London ecosystem. This ethos is expected to integrate into Proofpoint's culture.
As the founding city and primary operational center before its acquisition, the London headquarters was crucial for Tessian's strategic direction, product innovation, and access to a rich talent pool. It remains a key site for Proofpoint's Human Layer Security initiatives.
Prior to its acquisition by Proofpoint, Tessian established a global presence with key offices in London (UK), Austin (USA), and Boston (USA). These locations supported global operations including sales, marketing, customer support, and product development. As part of Proofpoint, Tessian's technology and expertise are now leveraged across Proofpoint's extensive global footprint, serving customers worldwide.
3 Finsbury Avenue
London
England
United Kingdom
Address: 801 Barton Springs Rd, Austin, TX 78704, USA
To expand reach in North America, provide localized support for US clients, and tap into Austin's burgeoning tech talent pool.
Address: 24 School St, Boston, MA 02108, USA
To strengthen East Coast presence, engage with a diverse range of clients, and access specialized talent in the region for Human Layer Security solutions.
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As of April 2025, Tessian' leadership includes:
Tessian has been backed by several prominent investors over the years, including:
The most significant executive changes at Tessian in the last 12 months (May 2023 - May 2024) revolve around its acquisition by Proofpoint, finalized in December 2023. This led to transitions for key leadership figures as Tessian integrated into Proofpoint. Standalone executive hires or departures unrelated to the acquisition were minimal during this period.
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Tessian, prior to its acquisition by Proofpoint, commonly utilized email formats typical for tech companies. The most prevalent format was `first.last@tessian.com`. While employees are now part of Proofpoint, historical contact information might follow this pattern.
first.last@tessian.com
Format
jane.doe@tessian.com
Example
85%
Success rate
Proofpoint Newsroom • December 29, 2023
Proofpoint, Inc., a leading cybersecurity and compliance company, announced it has completed its acquisition of Tessian. This strategic acquisition brings together Tessian's advanced AI-powered defense against accidental data loss and sophisticated email threats with Proofpoint's comprehensive threat protection platform....more
Tessian Blog • November 1, 2023
Tessian announced its agreement to be acquired by Proofpoint. The company highlighted the shared vision of securing the human element in cybersecurity and expressed excitement about accelerating its mission to protect enterprises from human-activated risk on a larger scale as part of Proofpoint....more
Tessian Blog • May 16, 2023
Tessian announced enhancements to its Human Layer Security platform designed to more effectively prevent data loss from misdirected emails and misattached files. The updates aimed to improve the user experience and strengthen defenses against common forms of human error leading to data breaches....more
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