AGU member since 1981. Professor of Earth and planetary sciences, Washington University, St. Louis, Missouri. Major research interests include the seismic structure of spreading centers and subduction zones, deep earthquakes, and seismic sources and lithospheric structure in polar regions. B.S., 1980, Wheaton College (Wheaton, Illinois), M.S., 1982, Northwestern University, Ph.D., 1985, Northwestern University. Professor at Washington University since 1985. Visiting Fellow, Australian National University, 2005. Member of Sigma Xi, the Seismological Society of America, and the American Association for the Advancement of Science. Author or coauthor of 85 publications in refereed journals, including 48 in AGU journals and seven in Nature or Science. Elected AGU Fellow, 2007. RIDGE2000 program Distinguished Speaker, 2007–2008. Member of IRIS Executive Committee (1990–1991, 1994–1998), Global Seismic Network standing committee (1992–1994), and chair of the Data Management Committee (2006 to present). Member of the Ocean Drilling Program ISSEP (1997–1998) and Science Committee (1998–2001). Member (1997–2002) and chair (2006) of the MARGINS program steering committee. Member of the RIDGE2000 steering committee and Executive Committee (2001–2006). Member of National Science Foundation Review Panels, 1994, 1998, 2004, 2006–2007. Member, National Academy International Polar Year Planning Committee, 2003–2006. Chair of the Ocean Bottom Seismograph Instrumentation Pool Oversight Committee, 2000–2003. AGU service as associate editor for the Journal of Geophysical Research, 1987–1993, and convener of numerous special sessions at AGU meetings.