1. Asst. Prof., School of Civ. and Envir. Engrg., Georgia Transp. Inst., Georgia Inst. of Technol., Atlanta, GA 30332.
2. Grad. Res. Asst., Dept. of Civ. and Envir. Engrg., Univ. of California, Berkeley, CA 94720.
3. Prof., Dept. of Civ. and Envir. Engrg., Univ. of California, Berkeley, CA.
4. Adj. Assoc. Prof., Dept. of Civ. and Envir. Engrg. and Assoc. Res. Engr., Univ. of California, Berkeley, CA.
5. Asst. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Illinois, Urbana-Champaign, IL.