John Heasman

John Heasman is Chief Information Security Officer (CISO) of Proof. An accomplished cybersecurity leader with over two decades of experience securing global technology companies, John oversees Proof’s information security program and serves Proof’s clients as the voice of the customer on security. In this role, John is at the forefront of safeguarding digital trust, navigating the rapidly evolving threat landscape shaped by AI and emerging fraud techniques.

Prior to joining Proof in 2024, he served as CISO at a public EdTech company for five years and before that, as Deputy CISO at DocuSign. John has presented at top cybersecurity forums like Black Hat, Defcon, and OWASP AppSec on diverse technical and leadership topics. He has also co-authored two top-selling books on cybersecurity.

He holds a Master’s degree in Engineering and Computing Science from the University of Oxford.