Computer pioneer who worked on the earliest video games and created the joystick.
He was inspired to study computers after a school field trip to the Mobil Research Lab in New Jersey.
He also worked on the architecture of the World Wide Web in the late 1990s as part of the W3C organization.
His father owned a hardware store, and at Christmas sold toy train sets that fascinated young Alan.
He and Tim Berners-Lee, who was one of the principal builders of the World Wide Web, were associates at W3C.