He taught law at university, and was president of the Ohio State Bar Association.

He alternated teaching and attending Mount Union College, Alliance, Stark County, Ohio, for seven years, and graduated A.B.

[3][4] Hart was admitted to the bar in Ohio, June 10, 1897, and to the United States District Court for the Northern District of Ohio and United States Court of Appeals for the Sixth Circuit, March 23, 1903.

[3] Hart was a member of the legal advisory board of Stark County during World War I.

In November, 1934, Hart was elected as a Republican to fill a short term on the Ohio Supreme Court, and resumed private practice afterward.