She met Raymond Palmer in 1949 at the World Science Fiction Convention in Cleveland, and was hired to assist him at Clark Publications, his publishing company.
[1] She worked on Other Worlds from May 1950; Palmer was incapacitated by an accident for a while shortly after she was hired, though he remained involved from his hospital bed.
[3] Science fiction historians Mike Ashley and E.F. Casebeer both consider that she had a strong positive influence on the magazines, and was probably responsible for acquiring much of the better material Palmer published.
[4][5][6] After Palmer closed his offices in Evanston, Illinois in 1955, Mahaffey continued to work on the magazine by mail from Cincinnati.
[7] In 1956, an unexpected tax bill forced Palmer to lay off Mahaffey, and he ran the magazine by himself from that point on.