Over the past 22 years, there have been 1,648 talks and panels, as well as 1,655 speakers, at DEF CON. Here they are (by speaker and con) plotted on one network map.
Congratz to Dan Kaminsky, Jennifer Granick, Richard Thieme, Joe "Kingpin" Grand, and Bruce Potter for being the most frequent DEF CON speakers.
I will (somehow) render the presentation titles soon.
Here is a slightly clearer version of this map, but for the hi-rez original .png, .pdf, or .ps, please email me at 2501research /at/ gmail.com.