I'm an urban planner, writer, and transportation researcher. Currently, I direct the Clean Transportation program at the Union of Concerned Scientists, fighting for a transportation system that protects the climate and public health while enabling everyone to affordably access their needs. I've worked on sustainable transportation since 2007.

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My first book, Better Buses, Better Cities, was published in 2019 by Island Press. I also wrote the conclusion to 2023's Justice and the Interstates. I regularly write and speak about urban issues.