Dr. Mark Ludwig spoke at the first two DEFCONs and is known for his virus writing philosophy.
He is the author of the books:
-The Little Black Book of Computer Viruses
-The Giant Black Book of Computer Viruses
-Computer Viruses, Artificial Life and Evolution
-The Little Black Book of Email Viruses
He also ran his own newsletter titled "Computer Virus Developments Quarterly" and at DEFCON 2 gave out a "Best Virus" award.