From Wikipedia

Christien Rioux, also known by his handle DilDog,^[1] is the co-founder and chief scientist for the Burlington, Massachusetts based company Veracode, for which he is the main patent holder.^[2]

Educated at MIT, Rioux was a computer security researcher at L0pht Heavy Industries and then at the company @stake (later bought by Symantec).^[1] While at @stake, he looked for security weaknesses in software and led the development of Smart Risk Analyzer (SRA).^[3] He co-authored the best-selling Windows password auditing tool @stake LC (L0phtCrack) and the AntiSniff network intrusion detection system.^[4]

He is also a member of Cult of the Dead Cow and its Ninja Strike Force. Formerly, he was a member of L0pht.^[7][8]

DilDog is best known as the author of the original code for Back Orifice 2000,^[6][9][10] an open source remote administration tool. He is also well known as the author of “The Tao of Windows Buffer Overflow.”