Zachariah received a 1976 Edgar Award for Best Juvenile Mystery from the Mystery Writers of America. Jane Leslie Conly later published two sequels to Mrs. Frisby and the Rats of NIMH: Racso and the Rats of NIMH (1986) and R-T, Margaret, and the Rats of NIMH (1990). Personal life Robert Conly married Sally McCaslin in 1943. The couple had four children, three daughters and a son. The marriage lasted until his death from a heart attack thirty years later in 1973. Mrs. Conly has written about her husband under the name Sally O'Brien. Published books All are novels published as by Robert C. O'Brien. The Silver Crown (Atheneum Books, 1968) Mrs. Frisby and the Rats of NIMH (Atheneum, 1971) A Report from Group 17 (Macmillan, 1972) Z for Zachariah (Atheneum, 1974) References Notes Sources consulted Masis, Boris (1997). "What has been said about Robert C. O'Brien". The Z for Zachariah Nuclear Comparison Page (borism.net/zforz). External links O'Brien's entry at The Encyclopedia of Science Fiction 1918 births 1973 deaths American people of Irish descent American children's writers American male journalists Journalists from New York City American speculative fiction writers Edgar Award winners Newbery Medal winners Writers from Brooklyn Williams College alumni Writers from Washington, D.C. 20th-century American novelists American male novelists 20th-century American male writers Novelists from New York (state) 20th-century American non-fiction writers 20th-century pseudonymous writers