Dyson was best known for his work as a security consultant with NASA during his life. In addition, he would be known as one of the people who started Coffee Wars at Defcon 8.
Passed away on December 21st 2011
Actually had the highest score at the first Defcon Coffee Wars, but was excluded from the results due to being a 'staff entrant'
http://www.forbes.com/global/2000/0221/0304076a.html
http://obits.dignitymemorial.com/dignity-memorial/obituary.aspx?n=Jay-Dy...
http://www.coffeewars.org/
http://www.treachery.net/~jdyson/