From 1947 to 1952 he was a correspondent for the American journal Opera News.
Harold Pinter | Harold Wilson | Harold Macmillan | Harold Bloom | Harold Godwinson | Harold Lloyd | Harold Stassen | Harold Prince | J. Harold Ellens | Harold Holt | Sir Harold Hillier Gardens | Harold Washington | Harold Hitz Burton | Harold Alexander, 1st Earl Alexander of Tunis | Harold Peto | Harold & Kumar Go to White Castle | Harold Arlen | Harold | Harold Budd | Jack Rosenthal | Harold Eugene Edgerton | Harold Bauer | Joe Rosenthal | Harold von Schmidt | Harold Robbins | Harold Laski | Harold Gould | Harold Gillies | Harold Bradley | Harold Alexander |
He is the author of Carl Maria von Weber (Hamish Hamilton, 1968, 2nd ed. Cambridge UP, 1976), the standard study of Weber in English; German Opera: From the Beginnings to Wagner (2001) and the co-author of The Concise Oxford Dictionary of Opera (1964, with Harold Rosenthal) and The Oxford Dictionary of Opera (1992, with Ewan West).
Rosenthal, Harold and Warrack, John (1979) The Concise Oxford Dictionary of Opera, 2nd edition, Oxford University Press.