The papers consist of correspondence, diaries, writings, teaching files, and memorabilia documenting the professional career and personal life of Irving Fisher, a mathematician, political economist, author, inventor, and activist in social causes. The materials reflect Fisher's interests in economics, the League of Nations, monetary theory and policy, national politics, health reform, prohibition, nutrition, and other topics. Major correspondents include politicians, economists, members of the Yale community, family members, and personal friends. The papers include photocopies of documents in other repositories. The papers form part of the Contemporary Medical Care and Health Policy Collection.