RCA, FRSA, OSA (1893-1941). Born in Ottawa, Ontario, Hennessey studied at Albion College, Michigan (B.A. 1916) but he was largely self-taught. He travelled to the Arctic Circle as an assitant naturalist and artist (c. 1907). He worked for the Geological Survey of Canada (1913-15) and as an entomologist for the federal Department of Agriculture (1921-41). Working mainly in coloured chalk but also in oil and pastel, he painted landscapes, habitat scenes and animals, especially birds. He painted in the Laurentians, Gatineau, and Gaspe areas of Quebec and in Algonquin Park in Ontario. He illustrated several bird books such as “Birds of Canada” by P. Taverner, and exhibited with the RCA between 1921-1941 and the AAM between 1922-1940. His work is in the collections of the AGO, MQ and NGC.