AGU member since 1972. Professor, Department of Geosciences, University of Massachusetts, Amherst. Volunteer experience includes American Geophysical Union: Geomagnetism and Paleomagnetism section secretary; Fall Meeting program chair; Eos editor; Committees: Education and Human Resources, Budget and Finance; Statutes and Bylaws; Fleming Medal, Geophysical Research Letters Editor Search; Geological Society of America: Geophysics Section chair, Bulletin associate editor, Research Committee, Day Medal Committee, Penrose Medal Committee; United States National Committee, International Union of Geodesy and Geophysics; United States representative, International Association of Geomagnetism and Aeronomy.