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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.

Gideon O. Whittemore family of Pontiac and Tawas City, Michigan. Business and personal correspondence of Whittemore, his wife, their son James O. Whittemore, and other members of the Whittemore, Mack, and Abram Mathews families; also business and legal documents, sermons, photographs, and miscellaneous papers, covering family matters, Tawas City, Michigan (which the family founded), lumbering, journey of the Mormons across the United States and settlement in Salt Lake City, Utah, University of Michigan and its branches, and family genealogy.

The papers date from 1817 to 1978, and include correspondence, business papers, deeds, genealogical materials, photographs and other papers of Gideon O. Whittemore, his wife, their son James Olin Whittemore and other member of the Whittemore, Mack, Harlow, and Abram Mathews families. Letters of Temperance Mack and Almira Covey document in part the journey of the Mormons across the United States and settlement in Salt Lake City. Other papers relate to activities in Tawas City (which the family founded), lumbering interests, and other business matters. A portion of the papers of James Olin Whittemore pertain to his activities as a student at the University of Michigan, class of 1846.

The Whittemore family collection has been arranged into the following series: Correspondence; Other Family papers; Genealogical records; Temperance Mack letters and related; Individual Whittemore family members; Photographs; and Business and professional ledgers and daybooks.