Douglas Adams (1952-2001) was the much-loved author of the Hitchhiker's Guides, all of which have sold more than 15 million copies worldwide. Photo by michael hughes from berlin, germany (douglas adams Uploaded by Diaa_abdelmoneim) [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons.