Tannenbaum, Frank, 1893-1969, American historian, b. Austria. He received his Ph.D. from the Brookings School of Economics in 1927. After an early career as a labor leader, journalist, and economic adviser, he became an expert in institutional history and made notable studies of labor, slavery, and the penal system. He is known chiefly, however, as an expert on Latin America. His work in the 1930s as an adviser to the Mexican government led to his book Peace by Revolution: An Interpretation of Mexico (1933). He played a key role in the development of the Farm Security Bill during the New Deal and in the creation of the university seminars at Columbia. He was professor of Latin American history at Columbia from 1935 until his retirement in 1962. His major works include Slave and Citizen (1947), Mexico: The Struggle for Peace and Bread (1950), A Philosophy of Labor (1951), and Ten Keys to Latin America (1962).