Painter, jeweller and relief construction maker, born in London, son of the Irish dramatist Sean O’Casey. In 1939 the family moved to Devon, where Breon attended Dartington Hall School and was taught metalwork by the ex-Bauhaus teacher Naum Slutski. After studying three years at the Anglo-French Art Centre, O’Casey moved to St Ives, becoming assistant to the sculptor Denis Mitchell, then Barbara Hepworth. Mixed shows included the RWA’s Artists from Cornwall, 1992; Shining Through, Crafts Council, 1995; and Gordon Hepworth Fine Art, Newton St Cyres, 1997. Had many solo exhibitions, including Victoria & Albert Museum Craft Shop, 1985; The Oxford Gallery, Oxford, from 1985; Taylor Galleries, Dublin, 1988; Collier/Campbell, 1990; Berkeley Square Gallery, 1999 and 2003; Scolar Fine Art, 2001; and Six Chapel Row, Bath, 2005.