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Civil engineer, served as Michigan state highway commissioner, chairman of the Mackinac Straits Bridge Authority and president of Portland Cement Company. Papers primarily document work with highway commission and Mackinac Straits Bridge Authority.

The papers, 1928-1968, of G. Donald Kennedy document his career in civil engineering, his participation in professional organizations, his activities as a state official, and as a supporter of the Michigan Democratic Party. The collection Includes correspondence, speeches, minutes, reports, articles, clippings, and photographs. The files relate to his work as municipal engineer in Pontiac, Michigan, with the Mackinac Straits Bridge Authority, the American Association of State Highway Officials, the Automotive Safety Foundation, and the Huron-Clinton Metropolitan Authority. The collection also includes papers relating to highway and airport construction, to economic mobilization during World War II, the Willow Run Bomber Plant, state Democratic Party matters, particularly the campaign visits of President Roosevelt to Michigan in 1936.

Detroit, Michigan industrialist and director of the McMath-Hulbert Observatory of University of Michigan (located on Lake Angelus near Pontiac, Oakland County, Michigan.). Correspondence concerning astronomy, particularly celestial photography, and the development of the McMath Observatory, financial records, plans for telescope equipment, and printed materials.

The Robert R. McMath papers consist primarily of correspondence concerning astronomy, particularly celestial photography, and the development of the McMath-Hulbert Observatory of the University of Michigan, financial records, plans for telescope equipment, and printed materials. Correspondents include some leading astronomers of the day but the bulk is with his collaborators in construction and operation of the Observatory and with the Heber D. Curtis, chair of the University of Michigan Astronomy Department and university president Alexander Ruthven. Writings include articles by McMath about the equipment and operation of the observatory and reports on specific astronomical observations made there. The papers have been arranged into the following series: Biographical; Correspondence; Miscellaneous; Organizational Affiliations; Writings; McMath-Hulbert Observatory, Lake Angelus; and Research and topical files.