I was part of a panel scheduled with Aaron Barr and Josh Corman that was moderated by Paul Roberts at DEF CON 19 in 2011. Due to legal concerns regarding HBGary, Barr had to bow out last minute and Kryptia stepped in to participate. He began wearing a disguise so the audience thought it might be Barr.
Download: Video of Slides (via archive.org)
Download: Video of Speakers & Slides (via archive.org)
Download: Audio of Panel (via archive.org)