Cal Henderson (born Callum James Henderson-Begg on January 17, 1981) is a British computer programmer and author based in San Francisco. He was educated at Sharnbrook Upper School and Community College.
He's best known for co-owning and developing the online creative community B3ta[1] with Denise Wilton and Rob Manuel; being the chief software architect for the photo-sharing application Flickr[2] (originally working for Ludicorp[3] and then Yahoo) and writing the book Building Scalable Web Sites[4] for O'Reilly Media. He's also worked for EMAP[4] and is responsible for writing City Creator[5] among many other websites, services and desktop applications.
He is color blind, and has worked on applications to make the web more accessible to the color blind.[6]
Cal's personal website currently describes him as Glitch Engineer.[7]