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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.

Democratic governor of Michigan, 1961-1963; gubernatorial office files, campaign files, papers from his career as state senator and lieutenant governor.

The John B. Swainson collection consists of four subgroups of files: pre-gubernatorial (covering the period of 1943 to 1960), gubernatorial (covering his one-term, two-year tenure as the state's chief executive), post-gubernatorial (covering the years since he left the governor's office, 1963 to 1975), and visual materials.

The great bulk of the collection is the gubernatorial subgroup documenting the last months of Swainson's term as lieutenant governor under Governor G. Mennen Williams, the 1960 campaign for governor, his gubernatorial administration, and his unsuccessful campaign for re-election. The importance of the collection, as with all gubernatorial records, is its documentation of public policy issues of the early 1960s and the relationship of the governor to the legislature, to the heads of the state's various boards and commissions, to the federal government, and to the citizens of Michigan.