 Christy was the Director of the Defense Cyber Crime Institute from 2003–2006, and Director of Operations of the Defense Computer Forensics Laboratory from 2001–2003.Christy was chief of the Air Force Office of Special Investigations (AFOSI) computer crime investigations unit from 1989–1996.As the founder of the world's largest digital forensics shop, he is notable for his involvement in high priority government computer security.