1. Senior Lecturer, Dept. of Civil, Mining and Environmental Engineering, Univ. of Wollongong, Northfields Ave., Wollongong, NSW 2522, Australia.
2. Senior Principal, Coffey Geosciences Pty. Ltd. and Emeritus Professor of Civil Engineering, Dept. of Civil Engineering (J05), Univ. of Sydney, Sydney, NSW 2006, Australia.