Hmm, let’s see. Greg Bear, Gregory Benford, Orson Scott Card, Anne McCaffrey, John Ringo, B. V. Larson, T. R. Harris, Richard Phillips, Michael McCloskey... There are others, but these will do for now.
As others have said here, of course our own Travis McGee, but I don’t think we can classify his books as science fiction.
Greg Bear’s “Dead Lines” was one of the most original ideas I have read in a while. If not a completely original idea in and of itself, what he did with it was.