AGU member since 1983. Professor of Geophysics (since 1991), Director of Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics, and Earth Section Head, Scripps Institution of Oceanography, University of California, San Diego. Major research interests are using paleomagnetism to study the geodynamo; geomagnetic field modeling and secular variation studies using paleomagnetic, historical, and modern observations; electrical conductivity studies of Earth's mantle; statistical methods and inverse problems, especially applied to studying the paleomagnetic field; paleomagnetic databases. B. S. (Honors), 1979, University of Western Australia; M. S., 1982, Australian National University; Ph.D., 1987, Scripps Institution of Oceanography, University of California, San Diego. Member of Royal Astronomical Society, American Association for the Advancement of Science, SEDI Advisory Committee. Author of over 60 refereed articles, 25 in AGU journals. Royal Astronomical Society's Price Medal for Geomagnetism, 1997; AGU Fellow, 1999; GP secretary, 1998–2000; Associate Editor, Journal of Geophysical Research, 1994–1997; AGU SEDI Committee, 1996–1998; Guest editor, G-cubed Theme, 2002–2005; Fleming Medal Committee, 2001 to present; GP Executive Committee, 1998 to present; Interim GP editor for Eos, 2000; G-cubed advisory Committee, 2005 to present; AGU Publications Committee, 2006–2008; GP President Elect 2006–2008.