Irish conceptual artist whose most famous works included "The Oak Tree" and other paintings and murals. Emeritus Professor of Fine Arts at Goldsmiths.
His artistic talents were encouraged by a priest at St. Anselm's Abbey School.
He became a prominent teacher of members of the Young British Artists movement of the 1980s.
He married and had a daughter with fellow artist Jan Hashey before divorcing.
He was greatly inspired by Mark Rothko.