Cohen then formed a considerable law practice in Cincinnati and became a senior member of the law firm Cohen & Mack. He previously studied law in the office of
Samuel F. Cary, and after he was admitted to the bar he formed a partnership with L. W. Goss. By 1917, he was senior member of the law firm Cohen, Mack & Hurtig. He specialized in corporation, commercial, and negligence cases. He was also president of the Peoples Bank & Savings Co. and the Bay Poplar Lumber Co. Cohen served on the
Cincinnati City Council for several terms, beginning when he was 25. A member of the
Democratic Party, he was chairman of the convention that nominated
Gustav Tafel for Mayor of Cincinnati and gave the keynote speech at that convention. In 1897, he was elected to the
Ohio Senate as one of three senators from
Ohio's 1st senatorial district (
Hamilton County). He was re-elected to the Senate in 1899 as part of a Fusion ticket and was assigned Senate Minority Leader. In 1900, he was the Fusion candidate for
Mayor of Cincinnati, When he was 85, he worked to suppress
Jim Crow barriers in Cincinnati's hotels and bars and used his prestige to gain guarantees of unbiased services from local businesses.
1916,
1932,
1936,
1940, and
1948 presidential elections. Although he served as a presidential elector six times and presided over the state's electoral college five of those times, he believed the electoral college was "obsolete for a century and a half" and should be replaced with a more modern system. He was selected to nominate
Judson Harmon as
Governor of Ohio, and when Harmon became governor he appointed Cohen Ohio's representative to the
Uniform Law Commission. == Honors ==