Upon the end of the war and his resignation from the volunteer army, Kennedy returned to Bellefontaine. He studied law with judge William H. West.[2][3] He was admitted to the bar in 1866 and commenced practice in Bellefontaine. He was appointed by President Rutherford B. Hayes as collector of internal revenue for the fourth district of Ohio, serving from 1878 to 1883. He was the lieutenant governor of Ohio from 1885 to 1887.
He was appointed by President William McKinley in 1899 as a member of the Insular Commission, which was directed to investigate and report upon conditions existing in Cuba and Puerto Rico and served as its president.
Death
Robert P. Kennedy died in Columbus, Ohio in 1918 at the age of 78.
Private life and family
Kennedy was a member of the Grand Army of the Republic, a Scottish RiteFreemason, and member of the Presbyterian Church.[3] He was married on December 29, 1862 at Bellefontaine to Maria Lewis Gardner of that city. She died in 1893, leaving four children.[3] He married at Wabash, Indiana to Emma (Cowgill) Mendenhall of that city on September 4, 1894. She survived him.[3]