1. Grad. Student, School of Civ. and Environmental Engrg., Cornell Univ., Ithaca, N.Y.
2. Assoc. Prof., School of Civ. and Environmental Engrg., Cornell Univ., Ithaca, N.Y.
3. Prof. School of Civ. and Environmental Engrg., Cornell Univ., Ithaca, N.Y.
4. Lect., Univ. of Tasmania, Hobart, Tasmania, Australia