David has been working in the security field for a long, long time...and active in the security community for over a decade. When not engaged in paying work, he enjoys building and solving cryptography puzzles, playing Pokemon Go, and helping out with his kids' Boy Scout Troop. David runs the KhanFu conference scheduling system, volunteers at ShmooCon and Black Hat, and has recently received a US amateur radio license (though he hasn't had enough time to really play with his new radio...)