Versatile painter and teacher, born in County Armagh, Northern Ireland. He studied at Belfast School of Art, in 1910 gained a scholarship to attend Dublin’s Metropolitan School of Art where William Orpen was among his teachers, went to the Slade School of Fine Art and then worked in Paris. From 1915 taught at Dublin’s Metropolitan School, went to Florence in Italy and then in the late 1920s to London, where he became a noted portrait painter. The painters Orpen, John Lavery and Jack B Yeats were among his subjects. Among his pupils was Winston Churchill. In 1941 Sleator settled in Dublin, soon becoming president of the RHA, continuing until he died. Also showed at RA, Royal Glasgow Institute of the Fine Arts and RP. In 1951 Victor Waddington Galleries, Dublin, held a memorial show.