David Perry has been a cryptologic mathematician at the National                      
Security Agency for 8 years, having received his Ph.D. in Mathematics from                  
the University of Illinois at Urbana-Champaign in 1999 and teaching at Ripon                
College in Wisconsin for two years.  He continues to teach a three-week                     
course in Cryptology for the Johns Hopkins' Center for Talented Youth                       
program every summer where he spends at least fifteen minutes trying to                     
convince his teenaged students that he's not trying to recruit them, does                   
not in fact have a chip in his head, and the black helicopters that seem to                 
appear above the campus nearly daily is a coincidence.