(January 4, 1877 - September 2, 1943) an American painter and poet.

Cleophas and His Own: A North Atlantic Tragedy is a story based on two periods he spent in 1935 and 1936 with the Mason family in the Lunenburg County, Nova Scotia fishing community of East Point Island. Hartley, then in his late 50s, found there both an innocent, unrestrained love with a hunky young fisherman, a love that was destined for tragedy.

Here's his Wikipedia article.