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- Professor, Civil and Environmental Engineering
- Professor, Civil and Environmental Engineering
- Professor, Civil and Environmental Engineering
- Director of the Institute of Transportation Studies
- Professor, Civil & Environmental Engineering
- Professor, Civil & Environmental Engineering
- Department Chair
- Associate Professor, Civil & Environmental Engineering
- Sustainable Transportation Engineering Graduate Group Co-Chair
- Professor, Civil & Environmental Engineering
- Sustainable Transportation Engineering Graduate Group Co-Chair
- Associate Faculty Director for Research & Mentoring, Institute for Transportation Studies
- Director, National Center for Sustainable Transportation
- Director, University of California Institute of Transportation Studies Transit Initiative Transit Research Center
