From the mid-1950s to 1984 with partner Robert Schaefer, he wrote for such shows as The Gene Autry Show, The Adventures of Kit Carson, Tales of the Texas Rangers, Maverick, Whirlybirds, Texas John Slaughter, Zorro, 77 Sunset Strip, The Adventures of Wild Bill Hickok, Buffalo Bill Jr., and many others.
Maxwell subsequently appeared in such series as Decoy, with Beverly Garland, Peter Gunn (twice), Alfred Hitchcock Presents (five episodes), Whirlybirds, Black Saddle, The Man and the Challenge, The Deputy, Cain's Hundred, Follow the Sun, Hong Kong, Target: The Corruptors, and Mr. Novak.