1. Professor, Dept. of Civil and Environmental Engineering, Univ. of Southern California, Los Angeles, CA 90089-2531.
2. Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Southern California, Los Angeles, CA 90089-2531.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Southern California, Los Angeles, CA 90089-2531.
4. Associate, Brandow and Johnston Associates, Los Angeles, CA.