Member of AGU since 1964. Distinguished professor of geology and geophysics, University of California, Riverside. Major interests include (1) flow and faulting mechanisms in subduction zones and relationships to earthquake mechanisms and mantle convection; (2) microstructural analysis of rocks exhumed up subduction zones to extract information about exhumation paths and processes. A.B. (honors), M.A., Ph.D. (distinction, 1968), all at University of California, Los Angeles. Postdoctoral materials science, 1968–1970, Case Western Reserve University. Faculty member University of California, Davis (1970–1992), chair of department, 1984–1988; University of California, Riverside (1993–). Director, Institute of Geophysics and Planetary Physics (1993–1995), vice chancellor for research (1995–2000), vice chair of department (2005 to present). Honorary professor of geophysics, China University of Geosciences, Wuhan (1998–). Visiting professor, Nantes, France (1978–1979), Monash, Australia (1984), Carnegie Institution of Washington (2000); Vetelson visiting professor, Columbia University (1991–1992); Allen Cox Visiting Professor, Stanford University (2007–2008). Fellow, AGU, MSA, AAAS; member, Cosmos Club, GSAs. Cofounder, Gordon Conference on Rock Deformation (1995–). Member, NAS Workshop on Future of Mineral Physics (1999); chair, Executive Committee of COMPRES (2004–2007). Author of 130 publications, 15 in AGU journals. Most important publications include discovery of transformation-induced faulting (Nature, 1989), discovery of extensive solubility of H₂O in wadsleyite (EPSL, 1995), discovery that rocks can be exhumed up subduction zones from depths exceeding 300 kilometers (Science, 1996); elaboration of mechanisms of dehydration embrittlement (Nature, 2004). Honors: NL Bowen Award, VGP section (1994); Francis Birch Lectureship, Tectonophysics section (1995); Abelson Lecturer, Carnegie Institution (2000); Veinig Meinez Lecturer, Utrecht (2000). AGU service: Associate Editor, JGR (1997–2002); secretary, Mineral and Rock Physics Committee (1993–1998); Hess Medal Committee (1998–2002). Tectonophysics section service: Rock Def Tech Committee (1988–1996); Executive Committee (1998–2002); chair, Fellows Committee (1998–2002).