Robert Silverberg
pen names: Calvin Aaargh, Gordon Aghill, Robert Arnette, Loren Beauchamp, T. E. Bethlen, T. D. Bethlen, Alexander Blade, Ralph Burke, David Challon, Dirk Clinton, John Dexter, Walter Drummond, Jeremy Dunn, Dan Eliot, Don Elliott (for erotic novels), Richard Greer, Charles D...