Daniel Joseph Boorstin was an American historian at the University of Chicago who wrote on many topics in American and world history. He was appointed the twelfth Librarian of the United States Congress in 1975 and served until 1987. He was instrumental in the creation of the Center for the Book at the Library of Congress.

Repudiating his youthful membership in the Communist Party while a Harvard undergraduate (1938–39), Boorstin became a political conservative and a prominent exponent of consensus history. He argued in The Genius of American Politics (1953) that ideology, propaganda, and political theory are foreign to America.