Favorite sci-fi writer?
Mine is, without a doubt, is Robert Heinlein. His books are stuff of legends! he's one of the most versatile writer I have ever known. He could write his characters and universes as monarchist, capitalistic, communist, semi-fascist - and still they would be likable. He could do action-packed, romantic, comedy, politics, philosophies, sociology, maths and physics. Most his works are witty and humorous, some controversial, some ahead of its time, all (which *I* have read) great.
He's got almost no signature except for marks of excellence. And this guy is awfully productive - of books
My favorite of his works:
The Moon is a Harsh Mistress, Glory Road, Starship Troopers.