AGU member since 1986. Professor of geophysics, Virginia Tech, Blacksburg, Virginia. Scientific interests focus on the dynamics of the interiors of the terrestrial planets, including subduction zones, plates, plumes, small-scale convection, and thermochemical convection. B.A. (honors), 1985, geophysical sciences, University of Chicago; Ph.D., 1990, California Institute of Technology. Green Scholar at Institute of Geophysics and Planetary Physics (IGPP), Scripps Institution of Oceanography, 1990–1991; faculty member at Purdue University from 1992 to 2007; visiting research scientist, IGPP, Los Alamos, 1999. Former editor of Earth and Planetary Science Letters (2000–2006). Author or coauthor of more than 50 refereed papers, 19 in AGU journals, and author of the ConMan convection code. AGU service as AGU Spring Meeting Tectonophysics program cochairman (1994–1995), AGU Fall Meeting Tectonophysics program cochairman (1995), Associate Editor, JGR-Solid Earth, 1995–1997, AGU Spring Meeting/Joint Assembly program chairman (2001–2004).