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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.