We meet Stanford chemical engineer William Tarpeh, who was recently awarded a 2025 MacArthur “Genius” Fellowship. Tarpeh’s work involves developing systems to extract nitrogen from waste streams to be used in fertilizer, cleaners and industrial chemical production. We talk to him about the environmental and public health benefits of his projects in Kenya and elsewhere, the role that California has played in his academic career and his plans for the fellowship.

Guests:

William Tarpeh, assistant professor of chemical engineering, Stanford University

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