David has over 10 years in the information security business. He started his professional experience as a founding member of Security Focus, which was acquired by Symantec in 2002. David also moderated the Bugtraq mailing list, a historically important forum for discussion of security vulnerabilities, for over four years. He has spoken at Black Hat, Can Sec West, AusCERT and numerous other security conferences, as well as made contributions to books, magazines and other publications. David also participated in a NIAC working group on behalf of Symantec to develop the first version of the CVSS (Common Vulnerability Scoring System) model and served as editor for the Attack Trends section of IEEE Security & Privacy for over three years. His current obsession is building Subgraph, a Montreal-based open source security startup.