Elmer Adler (1884-1962), printer, publisher, editor, book designer, author, and avid collector of books and fine prints, founded La Casa del Libro museum. In 1954, Adler visited Puerto Rico after retiring from Princeton University, where he established a department of graphic arts and served as a professor and library curator. He stayed to lead and organize LCDL and its formidable collection, which he built up book by book through donations.