Gibbons, J. 1979-81 Scholar Born 1954 Bristol, England. D.Phil 1978 Oxford. Appointments: Visiting Ass. Prof., Clarkson College of Technology, Potsdam, New York 1978-79; Royal Society Exchange Fellow, Rome, 1981-83; SERC Post-Doctoral Fellow, Imperial 1983-84; Lect.,Imperial College 1984-. Address: Department of Mathematics, Huxley Building, Imperial College, Queen’s Gate, London SW7 2BZ. E-mail: j.gibbons_at_ic.ac.uk