Occasionally I get asked for some sort of official bio. Here's one people can use:
John Graham-Cumming is a computer programmer and author. He studied mathematics and computation at Oxford and stayed for a doctorate in computer security. As a programmer he has worked in Silicon Valley and New York, the UK, Germany and France and currently works at CloudFlare. His open source POPFile program won a Jolt Productivity Award in 2004.Updated February 24, 2012
He is the author of a travel book for scientists published in 2009 called The Geek Atlas and has written articles for The Times, The Guardian, The Sunday Times, The San Francisco Chronicle, New Scientist and other publications.
He can be found on the web at jgc.org and on Twitter as @jgrahamc.
If you've heard of him at all, it's likely because in 2009 he successfully petitioned the British Government to apologize for the mistreatment of British mathematician Alan Turing.
He is a licensed radio amateur.