Ayoub El Aassal is a pentester working for Wavestone, a consulting firm based in France. He became interested in Mainframe security in 2014 when, during an audit, he noticed the big security gap between this platform and standard systems like Windows and Unix. A gap that makes little sense since z/OS has been around for a while and is used by most major companies to perform critical business operations: wire transfer, claim refunds, bookings, etc. If you want to test some of the tools showcased during the talk, you can check out his tools: https://github.com/ayoul3/