The Classic Typewriter Page has a list matching authors with their favorite typewriters. Now I know that Harlan Ellison and Philip K. Dick favored exactly the same model of typewriter.

Other sf/f authors listed are Isaac Asimov, L. Frank Baum, and Rod Serling, Kurt Vonnegut, J.R.R. Tolkien, Mark Twain, James Thurber, George Orwell, Stanislaw Lem, L. Ron Hubbard and David Gerrold.