For works of this author written in collaboration with Robert Silverberg, search also under: Randall, Robert, 1935- For works of this author written in collaboration with Laurence M. Janifer, search also under:  Phillips, Mark. For works of this author written under other names, search also under:  Gordon, David, 1927-1987  Langart, Darrel T., 1927-1987  Mackenzie, Jonathan Blake, 1927-1987  McKettrig, Seaton, 1927-1987