- (1955 - 1961) member, Maryland House of Delegates.
- (1961 - 1963) Appointed, by President John F. Kennedy, and served as United States Attorney for the District of Maryland.
- (1963) Appointed, by President John F. Kennedy, and served as United States Representative at the Interpol Conference in Helsinki, Finland, and also at the International Penal Conference in Bellagio, Italy.
- (1964) Ran as a Democrat for the U.S. Senate seat from Maryland, occupied by Republican J. Glenn Beall, Sr.
- (January 1965 - January 1971) Served as U.S. Senator from Maryland, and from 1969-1971, as Chairman of the U.S. Senate Committee on the District of Columbia.
- (1970) Ran for re-election to the U.S. Senate from Maryland, and was defeated by J. Glenn Beall, Jr., son of the man who Tydings had defeated six years earlier.
- (1974 - 1984) Appointed by the Governor of Maryland as a member of the Board of Regents of the University of Maryland 1974-1984, serving as chairman from 1982 to 1984.
- (1996 - 2000) Appointed by the Governor of Maryland as a member of the Board of Visitors, University of Maryland-College Park.
- (2000 - 2005) Appointed by the Governor of Maryland as a member of the Board of Regents of the University System of Maryland.
- (1971-present) Attorney in private practice. Partner at Finley, Kumble, Wagner, Underberg, Manley, Myerson & Casey (1971-1987); Partner at Anderson, Kill, Olick & Oshinsky (1988-96); Senior Counsel at Dickstein, Shapiro, Morin & Oshinsky (1996-).
- (2018) Book: My Life in Progressive Politics: Against the Grain," Texas A&M University Press ISBN-13: 978-1623496272 with John W. Frece
- (1970) Book: "Born to Starve". New York: William Morrow & Co.,
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