John Heasman is the CISO of Chegg, the leading student-first connected learning platform where he is focused on proactive approaches to building secure software. Prior to Chegg, John was the Deputy CISO at DocuSign. He has presented at Black Hat, DEF CON, OWASP AppSec and other industry forums on a diverse range of topics from web application security through to firmware APTs. He co-authored The Shellcoder’s Handbook (2nd Ed.) and The Database Hacker’s Handbook, and he has a Master's degree from Oxford University.