1. Graduate Student Researcher, Dept. of Civil and Environmental Engineering, Univ. of California, Davis.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Davis.
3. R&D Engineer II, Dept. of Civil and Environmental Engineering, Univ. of California, Davis.
4. Professional Research Engineer, Dept. of Civil and Environmental Engineering, Univ. of California, Davis.