Coleman was the owner of Bonitz of Georgia, a construction company which he started in 1954, and where he remained as board chairman until his death. Coleman began his political career as a Savannah City Council alderman during the
Malcolm Maclean administration from 1962 to 1966. He was then elected Chairman of the
Chatham County Commission, where he served from 1972 to 1976. During his term as Commission chairman, Coleman led the initiative to build the Chatham County Courthouse and jail. In 1980 Coleman was elected to the
Georgia State Senate, and took office, representing District 1, in 1981. He was elected to seven consecutive terms, serving a total of 14 years, until he stepping down in 1995. In the Senate, Coleman was Chairman of the Senate Transportation Committee and a member of the Appropriations Committee for 12 years and member of Continuation Committee for ten years. In 1995, after leaving the Senate, Coleman was appointed by Governor
Zell Miller to an at-large seat on the University System of Georgia
Board of Regents. In the post he served as Vice Chair and later Chair of the Facilities and Real Estate Committee. ==Later years==