Richard J. Walker

Richard J. Walker is a Distinguished University Professor of Geology at the University of Maryland, College Park. He holds the position of faculty in the Department of Geology, contributing extensively to research in isotope geochemistry and cosmochemistry. His work focuses on the chemical evolution of Earth's mantle, early Solar System planetesimal formation, and differentiation histories of planetary bodies such as Earth, the Moon, and Mars. Walker's research employs radiogenic isotopes and trace elements to address fundamental questions about planetary accretion and differentiation.

Education: Ph.D. in Geology from the State University of New York at Stony Brook (1984), M.S. (1981), and B.S. from the College of William and Mary (1979). He leads the Isotope Geochemistry Laboratory, which houses advanced mass spectrometry facilities for high-precision isotopic analysis. His research group investigates topics including tungsten-182 (182W) isotopes, osmium isotopes, and the geochemical signatures of mantle plumes and kimberlites.

Research Highlights: His studies on 182W isotopes revealed insights into early Earth processes, such as core formation and late accretion. He has explored mantle heterogeneity through analyses of ocean island basalts, komatiites, and kimberlites, linking isotopic anomalies to primordial mantle reservoirs. Collaborative projects include investigations of the North China Craton's lithospheric mantle and the genetic origins of iron meteorites.

Grants and Funding: Walker has secured numerous grants from NASA, NSF, and other agencies, supporting projects like the development of analytical techniques for tungsten isotopes and studies of planetary materials. His work has spanned decades, contributing to over 150 publications and mentoring numerous graduate and undergraduate students.

Labs/Teams: Director of the Isotope Geochemistry Laboratory at UMD, collaborating with international researchers on projects ranging from lunar sample analysis to the geochemistry of asteroid samples returned by missions like Hayabusa2.