Born April 1, 1926, in Cambridge, MA; daughter of George Herbert (a city administrator and U.S. Army colonel) and Anne Dorothy (a real estate agent) McCaffrey; married H. Wright Johnson, January 14, 1950 (divorced, 1970); children: Alec Anthony, Todd, Georgeanne. Education: Radcliffe College, B.A. (cum laude), 1947; graduate study, University of City of Dublin; also studied voice for nine years. Religion: Presbyterian. Avocational Interests: Singing, opera directing, riding, horse care. Memberships: Science Fiction Writers of America (secretary-treasurer, 1968-70), Mystery Writers of America, Authors Guild, Novelists' Ink, PEN (Ireland). Addresses: Office: Dragonhold-Underhill, Timmore Lane, Newcastle, County Wicklow, Ireland. Agent: Diana Tyler, MBA Literary Agents, 62 Grafton Way, London WIP 5LD, England.
Contributor to anthologies, including Infinity One, 1970; Future Love, 1977; and Camelot: A Collection of Original Arthurian Tales, 1995. Contributor to magazines, including Analog Science Fiction-Science Fact, Galaxy, and Magazine of Fantasy and Science Fiction.
Collections of McCaffrey's manuscripts are housed at Syracuse University, Syracuse, NY, and in the Kerlan Collection, University of Minnesota, Minneapolis.