National Academies, National Academies' Committee on Sources of Lead Contamination at or near Superfund Sites, 2016 – 2017.
Member of the Board of Trustees of the University Corporation for Atmospheric Research (UCAR), 2013-2017, chair 2015-2017.
University Corporation for Atmospheric Research, Members’ Nominating Committee (2011-2012).
University Corporation for Atmospheric Research, University Relations Committee, 1997-2003 (Chair 2002-2003).
American Geophysical Union, Committee on Public Affairs, 2004-2010 (Chair, 2007-10).
American Meteorological Society, Committee on Planned and Inadvertent Weather Modification, 2004-2007.
American Institute of Physics, Government Relations Advisory Committee, 2010-2012.
National Research Council, Research Associateship Program Review Panels, 1989-2009 (Chair 2005-2009).
Expert opinion concerning lead contamination in Kabwe, Zambia (2020).
Expert opinion concerning impacts of proposed Rosemont mine on air quality; for Save the Scenic Santa Ritas non-profit organization.
U.S. Department of Justice; and U.S. EPA; expert opinion concerning environmental fate of azides (2002).
State of Oregon House Environment Committee (HB2507), presentation “Sodium Azide in Automobile Airbags”, March 1, 2005, resulting in landmark legislation controlling airbag disposal: House Bill 2507.
Pima County Environmental Quality Advisory Council, appointed by County Board of Supervisors 2001-present. Chair 2000-present
Technical advisor to Pima County Department of Environmental Quality: 1) beryllium oxide, 2) Rosemont mine.
Sonora Environmental Research Institute, a community non-profit organization, advisory committee member 1996-present.
University of Arizona Strategic Planning and Budget (SPBAC) committee (elected) 2006-2012.
University Radiation Safety Committee, 2005-2020; Chair 2012-2020.