Following graduation, Kuhn began practicing law in Mount Clemens.[1] He served as circuit court commissioner of Macomb County until 1896, when he was elected Macomb County prosecuting attorney.[1] Kuhn was reelected in 1898 and 1900.[1]
In 1904, Kuhn became probate judge of Macomb County, and remained in that position until 1910, when he resigned to accept an appointment as Michigan attorney general.[1] The vacancy in the attorney general position had been caused by the resignation of John E. Bird, who had resigned to accept an appointment to the Michigan Supreme Court.[2]
He resigned in 1919 and briefly returned to private practice before becoming president of the Michigan Bell Telephone Company in February 1920.[1][2] Kuhn remained president of the telephone company until his death.[2]
He died on June 16, 1926, at Harper Hospital in Detroit, at the age of 65, after a brief illness.[1] He was buried at Mount Clemens.[3]