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- Director, Transportation at San Francisco Municipal Transportation Agency (SFMTA)
- Director of Research and Policy Analysis, Georgetown Climate Center
- Director of Fleet Engineering and Sustainability, PepsiCo
- Vice President and Chief Engineer, Sustainability and Future Mobility, Boeing
- Commissioner and Vice Chair, California Energy Commission
- Commissioner, California Energy Commission
- Chief Executive Officer and Co-Founder, TeraWatt Infrastructure Ambassador
- The William R. Timken Professor of Accounting, Emeritus, Stanford