As one of the largest advertising history collections in the world, the Hartman Center has built a reputation for its resources documenting advertising, sales, and marketing. The Center maintains the records of several advertising agencies and trade organizations, the professional papers of various marketing executives, collections of advertising ephemera created by private collectors, and a growing library of related books and periodicals. Information about Ogilvy & Mather's founder, employees, and advertising is contained in numerous collections identified in this guide. For more information, many of the Hartman Center collection guides are searchable on the web at http://library.duke.edu/rubenstein/findingaids/.
The agency of Hewitt, Ogilvy, Benson & Mather was founded by David Ogilvy in 1948 and changed its name to Ogilvy & Mather (O&M) in 1953. For convenience, both entities are referred to as O&M in this guide.