Copley attended the Elmira Free Academy. He initially worked in the coal office of General Charles J. Langdon in Elmira. When he was 17, he became the personal secretary of Mark Twain, who at the time was living at Quarry Farm. In 1904, he purchased the Lowman farm in Lowman and worked as a farmer. In 1914, he became a deputy county clerk. In 1916, he was elected county clerk, an office he held until 1923. He was also a secretary and director of the Elmira Mechanic's Savings Bank.[2] He served on the city council for six years.[3]
Copley attended the First Presbyterian Church. He was a member of the Freemasons and the Elks.[2] In 1905, he married Eleanor M. Lowman. Their children were John Gilbert and Mary Elizabeth.[1]
Copley died at home on September 11, 1946.[2] He was buried in Riverside Cemetery in Chemung.