Aaron Allston passed away at the age of 54. He was a fantastic game designer and author. Stuff he wrote that I love include the D&D Rules Cyclopedia, The Grand Duchy of Karameikos, and a ton of Hero books. His Star Wars novels were also pretty darn good. Rest in Peace, and thanks for all of the great works you did.
His website: http://www.aaronallston.com/