B.S., University of Iowa, 1989; M.S., University of Wisconsin (Madison), 1991; Ph.D., 1994. Research Fellow, Caltech, 1994-97; Senior Research Fellow 1997-98; Assistant Professor, 1998-2003; Associate Professor, 2003-06; Professor, 2006-.

Experimental and applied study of the isotope geochemistry of light elements (H, C, N, and O), including the following fields: Petrogenesis of basaltic lavas; geochemistry of mantle rocks; geothermometry and geospeedometry; aqueous alteration of meteorites; experimental study of natural volatiles in the H-C-N-O system at low temperatures; development of micro-analytical techniques; atmospheric and environmental chemistry; paleoclimate research.