He is known as "Cyberjunky", "Cjunky" or just "CJ" in the hacker community. Marc is the Head of Security and part of the CFP review board for DEF CON, the worlds largest hacker conference. After spending more than 15 years wrangling hackers, criminals and spooks Marc has seen it all. A proud SVC card holder Marc can often be seen speaking at security conferences in random exotic locations.