John D.J. Moore, 77;

Ex-Ambassador to Ireland

John D. J. Moore, 77, a one-time city official who was ambassador to Ireland in the Nixon Administration and director emeritus of W. R. Grace & Co. He was with Grace, a diversified chemical company, from 1946 to 1969 and became corporate vice president, serving in Peru, Washington and New York. Then-Vice President Richard M. Nixon had Moore accompany him to South America in 1958 and to the Soviet Union in 1959. In 1969, as President, Nixon appointed Moore ambassador to Ireland. Moore served six years, the longest tenure of any U.S. ambassador to that nation. In 1976 he rejoined Grace as a member of its board. He retired at the age of 75 but remained as director emeritus and as a consultant to the company. In New York on Monday of bone cancer.