Much of Tubb's work has been written under pseudonyms including Gregory Kern, Carl Maddox, Alan Guthrie, Eric Storm and George Holt. He has used 58 pen names over five decades of writing although some of these were publishers' house names also used by other writers: Volsted Gridban (along with John Russell Fearn), Gill Hunt (with John Brunner and Dennis Hughes), King Lang (with George Hay and John W Jennison), Roy Sheldon (with H. J. Campbell) and Brian Shaw. Tubb's Charles Grey alias was solely his own and acquired a big following in the early 1950s.