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Michigan State Police officer, 1923-1941, Michigan Civil Defense Director during World War II, State Police Commissioner, 1947-1951, Republican candidate for governor, 1954, served on Michigan Liquor Commissioner and as Detroit Recorders Court judge. Papers include extensive documentation of his service as Director of Civil Defense and State Police Commissioner and his political activities.

The Donald S. Leonard collection is a valuable resource to researchers studying topics of law enforcement and civil defense and Michigan state politics and government. The Donald S. Leonard collection has been arranged into seven series: Personal and Correspondence, 1925-1966; Civil Defense; World War II Era, 1941-1946; Michigan State Police, 1929-1952; Detroit Police Department, 1952-1954; Political Files, 1950-1956; Organization and Activities Files; Audio-Visual Materials; Committee on Equal Educational Opportunities. Leonard also taught law course at the State Police Recruit School and Metropolitan Police Academy of Michigan.

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.

Owen J. Cleary was an attorney, president of Cleary College in Ypsilanti (1940-1960), Michigan secretary of state (1953-1954), and chairman of the Republican State Central Committee (1949-1953). The collection includes correspondence, scrapbooks and clippings, organizational files, and Republican Party files.

The collection documents the later period of Cleary's life, mainly from 1945 to 1959. The series include Correspondence; Scrapbooks and clippings; Organizational interests; and Political files.

The great bulk of the collection consists of correspondence dated from 1945 to 1959 and documenting his work as Republican State chairman (1949-1953), his tenure as Michigan secretary of state (1953-1954), and his various other civic, political, and business involvements. There is included with this finding aid a selective index to Cleary's correspondents.