Harper won distinction as founder of Interpublic, once the world's largest advertising agency conglomerate, and as an innovator in the use of research to produce effective advertising. His meteoric career terminated soon after he was deposed as Chairman and Chief Executive Officer of Interpublic at age 53.
Harper devoted his remaining 20 years to other interests. Author of "Getting Results from Advertising"; served as chairman of the American Association of Advertising Agencies and the American Research Foundation; received the Parlin Award of the American Marketing Association for contributions to the advancement of marketing; elected to the Market Research Council's Hall of Fame.
Notes, clippings, published and unpublished manuscripts on business and marketing; but primarily personal materials.
Marion Harper Papers, ca. 1916-1989, Archives Center, National Museum of American History