Was it author Dean Koontz or author Kurt Vonnegut who used pen names early in their career?
Kurt Vonnegut: Kurt Vonnegut Jr. ( ; November 11, 1922April 11, 2007) was an American writer. Kurt Vonnegut:  In a career spanning over 50 years, Vonnegut published 14 novels, three short story collections, five plays, and five works of non-fiction. Dean Koontz: Dean Ray Koontz (born July 9, 1945) is an American author.
i don't know