Bernard Postal co-authored with Jesse and Roy Silver The Encyclopedia of Jews in Sports, the comprehensive 526-page reference “bible” of Jewish achievements in sports, published in 1965 by Bloch.

While Postal was best known for his books on Jewish-American history, he held such posts as editor of the Jewish Daily Bulletin in New York City from 1929 to 1931; editor of the Jersey City Jewish Standard from 1931 to 1933; reporter and editor of Seven Arts Feature Syndicate, a New York Anglo-Jewish news service, from 1933 to 1938; public relations director of B’nai Brith in Washington, D.C., from 1938 to 1946; public relationsdirector for the National Jewish Welfare Board in New York City from 1946 to 1970; and associate editor of Jewish Week. He held early career positions with the New York Times and the Jewish Telegraphic Agency. He founded Jewish Digest in 1955 and its editor until his death.

Among the books he authored are The Jewish Tourist Guide to the United States (with Lion Koppman, Jewish Publication Society, 1954); Landmarks of a People: A Guide to Jewish Sites in Europe (with S. H. Abramson, Hill & Wang, 1962); the four-volume American-Jewish Landmarks (with Koppman, Fleet Press, 1976–1979); and Guess Who’s Jewish in America (with
Koppman, New American Library, 1980).

Postal received the American-Jewish Tercentenary Award for contributions to American-Jewish history and various professional honors for his historical and reference writings.