Jayson is the author of the "Dissecting the hack: Series" (which is currently required reading at 5 colleges in 3 countries that he knows of).
Also the DEF CON Groups Global Ambassador. Plus the VP of InfoSec for SphereNY.
He's spoken at DEF CON, DEF CON China, GRRCon, DerbyCon at several other 'CONs & colleges on a variety of Information Security subjects.
He was also a guest lecturer for the Beijing Institute of Technology for 10 years.