The character of Conan has proven durably popular , resulting in Conan stories by later writers such as Poul Anderson , Leonard Carpenter , Lin Carter , L. Sprague de Camp , Roland J. Green , John C. Hocking , Robert Jordan , Sean A. Moore , Björn Nyberg , Andrew J. Offutt , Steve Perry , John Maddox Roberts , Harry Turtledove , and Karl Edward Wagner .