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Tim Sadler

Co-Founder & CEOTessian

Los Angeles Area

Member Since February 2022


Growth Strategy and Execution
People Management


Tim is the CEO and co-founder of email security company Tessian, whose mission to help organizations secure the human layer in their business. Since starting the company in 2013, Tim has raised around $130m from leading VC funds and grown the company across the UK and US. Tim relocated to the US, from the UK, in early 2020.

Company details


Company bio

Tessian’s mission is to secure the human layer. Using machine learning technology, Tessian automatically stops data breaches and security threats caused by human error - like data exfiltration, accidental data loss, business email compromise and phishing attacks - with minimal disruption to employees' workflow. As a result, employees are empowered to do their best work, without security getting in their way. Founded in 2013, Tessian is backed by renowned investors like Sequoia, Accel, March Capital, and Balderton and has offices in San Francisco, Boston and London. Request a demo here:



Area of focus

Cyber Security
Data Loss Prevention
Information Security

Company size

51 - 200

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