Greg has been engaged in development, security, hacking, and technology for, well, a substantial period. And yes, he's hacked mainframes. Greg breaks into systems and secures them, often the very same ones. He has written code with security holes and written code to find them. Greg can program in most languages and operating systems and has used most of the hacking tools available, as well as being skilled with architecture and multi-colored security teams. When not presenting and writing on security, architecture, privacy, and programming, his day job involves securing systems that are targeted by people who possess incentive, time, and money but are owned by individuals without the funds, managed by people who would prefer security didn’t exist, created by developers burdened with impossible deadlines, and operated by teams who are juggling tens, if not hundreds, of other programs.