Marquis Who's Who /ˈmɑːrkwɪs/ or /mɑːrˈkiː/ is an American publisher of a number of directories containing short biographies. The books usually are entitled Who's Who in... followed by some subject, such as Who's Who in America, Who's Who of American Women, Who's Who in the World, Who's Who in Science and Engineering, Who's Who in American Politics, etc. Often, Marquis Who's Who books are found in the reference section of local libraries, at corporate libraries, and are also used for research by universities.