Andy Oram is an editor at O'Reilly Media, a highly respected book publisher and technology information provider. An employee of the company since 1992, Andy currently specializes in free software and open source technologies. His work for O'Reilly includes the first books ever published commercially in the United States on Linux, and the 2001 title Peer-to-Peer. His modest programming and system administration skills are mostly self-taught.
Greg Wilson has worked on high-performance scientific computing, data visualization, and computer security, and is currently project lead at Software Carpentry (http://software-carpentry.org). Greg has a Ph.D. in Computer Science from the University of Edinburgh, and has written and edited several technical and children's books, including "Beautiful Code" (O'Reilly, 2007).