1. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, CA.
2. Assistant Professor, Dept. of Environmental Engineering, Univ. of Calabria, Arcavacata di Rende, Italy; Visiting Project Scientist, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, CA.
3. Senior Research Scientist, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, CA.