Hatten S.Yoder, Jr., an internationally known geologist, experimental petrologis and geochemist, and emeritus director of the Carnegie Institution of Washington's Geophysical Laboratory died on 2 August 2003, following complications from surgery. An AGU Fellow, Yoder served on AGU's Council from 1966 to 1968, and as president of the Volcanology, Petrology and Geochemistry Section from 1961 to 1964.
Born on 20 March 1921, Yoder was raised in Cleveland, Ohio, where he graduated from Lakewood High School. He obtained his bachelor's degree at the University of Chicago in 1940 and his Ph.D. in geology at the Massachusetts Institute of Technology in 1948. He received honorary doctorate degrees from the University of Paris VI, France, in 1981 and from the Colorado School of Mines in 1995.