Technomancer wrote:Yoko Kanno.
Right Technomancer, you beat me to it.
Hiroyuki Morioka - Wrote (and is in fact still writing more for) the Crest of the Stars novels that later got adapted into anime. Worth mention because of the detailed and epic nature of his novels. A true nerd, he even created his own language (the Abh language) for the stories. Talk about creating your own universe for a sci-fi novel.
It's kinda off-topic, but I included a link on constructed languages from wikipedia. I had no idea that many people were interested in that sort of thing.
Conlang
Masaki Kajishima - He's worked on the Tenchi movies, Bugglegum Crisis, and did the characters and story for Dual! (PTA).