AGU member since 1978. Professor II (Distinguished Professor), Department of Environmental Sciences, Rutgers University. Major interests in volcanic eruptions and climate, soil moisture, nuclear winter, land-atmosphere coupling, geoengineering, and global warming. B.A., Meteorology, University of Wisconsin, 1970; Peace Corps volunteer in the Philippines, 1970–1972; S.M. (1974) and Ph.D. (1977), Meteorology, Massachusetts Institute of Technology. Professor, Department of Meteorology, University of Maryland, 1977–1997; at Rutgers since then. Sabbaticals as AAAS Congressional Science Fellow (1986–1987), at Geophysical Fluid Dynamics Laboratory (1994–1995); and in Antarctica and then at the Laboratoire de Météorologie Dynamique, Paris (2004–2005). Member of AAAS, IAVCEI, and AMS. AMS Fellow, 1998. Author of 134 refereed journal articles, 66 in AGU journals, and 17 refereed book chapters, two in AGU books. UCAR representative from Rutgers, 2001 to present. Member, UCAR President's Advisory Committee (formerly the University Relations Committee), 2005–2008. Maryland State Climatologist, 1991–1997. Editor, Journal of Climate and Applied Meteorology, 1985–1987. AGU service includes: Associate Editor, Reviews of Geophysics, 1994–2000, 2006–present; Associate Editor (1998–2000) and Editor (2000–2005), Journal of Geophysical Research-Atmospheres; edited AGU Geophysical Monograph, Volcanism and the Earth's Atmosphere (2003). Member, AGU Atmospheric Sciences Section Executive Committee, 2000 to present; Chair and Organizer of AGU Chapman Conference on Volcanism and the Earth's Atmosphere, Thera, Greece, 2002; convener of seven different sessions at AGU meetings.