Craig, Harmon -
American geochemist. A chief scientist on numerous ocean expeditions, his work includes major contributions to the understanding of Earth's carbon cycle and the application of helium and argon isotope analysis to oceanography. After being trained in Chicago by his Ph.D. adviser, Harold Urey, Craig came to Scripps Institution of Oceanography at UC San Diego in 1955, and has worked there since. He is deeply involved in the GEOSECS project, a global net of profiles through the ocean designed to define the chemical properties of the ocean in detail.