One of the most celebrated authors in Science Fiction has died today, March 18 2008, at age 90. He authored, with Stanley Kubrick, what many consider to be the best Science Fiction movie ever filmed, 2001: A Space Odyssey. He has also been credited as being the visionary futurist who first conceptualized the geostationary communications satellite, making possible all modern communications. We here at the Sift pay tribute below.