1. Senior Lecturer, Dept. of Civil and Environmental Engineering, Univ. College London, Chadwick Building, Gower St., WC1E 6BT, London.; formerly, Departmental Lecturer in Chemical Engineering, Dept. of Engineering Science, Univ. of Oxford, Oxford, UK.
2. Professor of Civil Engineering, Dept. of Civil and Environmental Engineering, Imperial College, London SW7 2BU, UK.