Peter Kelemen is a geologist and the Arthur D. Storke Memorial Professor at Lamont-Doherty Earth Observatory. A member of the National Academy of Sciences (NAS) and an expert in carbonation of rock from Earth’s mantle, Kelemen wrote a chapter on carbon mineralization for a new NAS report, Negative Emissions Technologies and Reliable Sequestration: A Research Agenda. The report was commissioned by the United States government to guide its allocation of funding and requests for additional resources from Congress.