Joseph Leon Blau (May 6, 1909 – December 28, 1986) was an American scholar of Jewish history and philosophy.
He attended Columbia University, where he studied under Salo Wittmayer Baron.
Blau taught at Columbia from 1944 to 1977 and was chair of its Department of Religion from 1968 to 1977.
[1] Blau was one of the signers of A Secular Humanist Declaration in 1980.
[1] His notable writings include Christian Interpretation of the Cabala in the Renaissance (1944); Men and Movements in American Philosophy (1952); The Story of Jewish Philosophy (1962), The Jews of the United States, 1790–1840 (co-edited with Salo Baron, 1963), Modern Varieties of Judaism (1966), and Judaism in America (1976).