The presenter has been attending DEFCON for ~20 years, and has run various villages and contests for over 10 years. A professional pentester for over 24 years, his previously released research and tools are present in MetaSploit, blog posts, blah blah blah. The hacker is a long-time member of AHA (Austin Hackers Anonymous - takeonme.org ) and is well known for their "this one time on a pentest" stories. The thing is though. We aren't going to tell you their handle/name. It's not important. You don't need it. Don't pick a talk by how famous someone is.