10 Tech Innovators to Watch 2024

We’re on a Mission to Secure the Human Layer in the Modern Workplace, by Protecting All the Digital Interactions People Need to do their Jobs: Tim Sadler, CEO of Tessian

Tim Sadler: We understand people’s behaviors on platforms like email to detect and prevent advanced threats, so that your people can focus on doing their best work in a secure, yet productive way.

By SBR
Oct 30, 2024 7:15 PM Updated May 13, 2025
Tim Sadler, Co-Founder & CEO, Tessian Photo by SBR

Tim Sadler, Co-Founder & CEO, Tessian


Tessian is a leading cloud email security platform that intelligently protects organizations against advanced threats and data loss, while offering real-time guidance on security risks. Using machine learning and behavioral data science, Tessian automatically stops threats that evade legacy Secure Email Gateways, including advanced phishing attacks, business email compromise, accidental data loss and insider threats. Tessian’s intelligent approach not only strengthens email security but also builds smarter security cultures in the modern enterprise. 

Tessian was founded in 2013 and is based in Boston.

SME Business Review reached out to Tim Sadler, co-founder and CEO of Tessian, for an interview, and he provided valuable insights into the company's innovative approach to enhancing email security through machine learning. Tim emphasized Tessian's commitment to reducing human error risks while ensuring seamless integration with existing email systems. Here’s what Mr. Sadler had to say. 

Interview Excerpts

What specific cybersecurity challenge does Tessian address in organizations?

Tessian addresses the significant cybersecurity challenge posed by human error in email communications. Recognizing that a large proportion of security breaches stem from inadvertent actions, such as clicking on phishing links or mistakenly sending sensitive information to the wrong recipient, Tessian focuses on creating a safer email environment.

How does Tessian utilize machine learning to enhance email security?

Tessian employs machine learning algorithms to analyze email behaviors and patterns within organizations. By examining the interactions of employees with their email, Tessian creates detailed user profiles. This process enables the platform to identify anomalies and potential threats in real-time, allowing for proactive security measures rather than reactive ones.

In what way does Tessian's approach differ from traditional cybersecurity tools?

Unlike traditional cybersecurity tools that often rely on predefined rules and threat intelligence, Tessian takes a more human-centered approach. By understanding and anticipating user behavior, Tessian offers tailored security solutions that focus not only on external threats but also on mitigating risks arising from internal human factors. This nuanced perspective allows Tessian to provide solutions that are more aligned with the actual behaviors of employees.

What types of email-related incidents does Tessian's platform specifically aim to prevent?

The platform is designed to prevent several types of email-related incidents, including phishing attacks that attempt to deceive users into providing sensitive information, misdirected emails where confidential data is accidentally sent to unintended recipients, and unauthorized sharing of sensitive documents. By addressing these vulnerabilities, Tessian helps organizations safeguard their information and maintain compliance with data protection regulations.

How does Tessian facilitate compliance with data protection regulations?

Tessian assists organizations in maintaining compliance with various data protection regulations by providing comprehensive visibility and control over email communications. The platform generates detailed audit trails of email activities, enabling organizations to track and manage data sharing effectively. This transparency is crucial for demonstrating compliance during audits and ensuring that sensitive information is handled according to regulatory requirements.

What is the integration process for Tessian with existing email systems?

Tessian is designed to integrate effortlessly with popular email platforms such as Microsoft Outlook and Google Workspace. This integration occurs in the background, requiring minimal disruption to daily operations. Employees can continue using their existing email systems without the need for extensive training or changes in workflow, ensuring that security measures enhance rather than hinder productivity.

How does Tessian support organizations with a remote workforce?

As remote work becomes increasingly prevalent, Tessian's platform offers robust protection that adapts to the needs of a distributed workforce. Employees can communicate securely via email regardless of their physical location, whether in the office, at home, or traveling. Tessian’s security measures remain effective across all settings, ensuring consistent protection of sensitive information.

What commitment to innovation does Tessian uphold in the cybersecurity field?

Tessian maintains a strong commitment to innovation by continually evolving its platform to address emerging threats in the cybersecurity landscape. This involves regularly updating its machine learning algorithms, enhancing user experience, and incorporating feedback from clients to refine its offerings. By staying ahead of the curve, Tessian ensures that organizations benefit from cutting-edge security solutions tailored to meet their needs.

About | Tim Sadler

Tim Sadler, co-founder, is the CEO of Tessian. 

We believe people are the most important decision makers in any organization. We’re a group of data scientists, engineers, designers, creative thinkers, and commercial experts who are passionate about protecting people processing data in the enterprise.

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