Editors
#1, October, 1950 - #2, December, 1950 -- Raymond A. Palmer (Editor)
#3, February, 1951 - #63, October, 1958 -- William L. Hamling (Editor)
Publishers
#1, October, 1950 - #2, December, 1950 -- Clark Publishing Company, Evanston, Illinois.
#3, February, 1951 - #63, October, 1958 -- Greenleaf Publishing Company, Evanston, Illinois.