Jim Butler is Director of the Global Monitoring Division at NOAA’s Earth System Research Laboratory (NOAA/ESRL) in Boulder, Colorado, where he has conducted research on climate forcing and ozone depletion for 25 years. In his current capacity, he oversees the nation’s continuing measurements of atmospheric constituents that affect the world’s climate, including carbon dioxide and other greenhouse gases, ozone-depleting gases, aerosols, and surface radiation. Dr. Butler’s published works address the distribution and cycling of gases in the atmosphere, their production and consumption by the ocean, their exchange across the air-sea interface, their distribution in polar snow, and methods for their analysis. He is a regular contributor to international documents on global warming, stratospheric ozone depletion, and atmospheric chemistry. Before coming to NOAA, Dr. Butler was a Research Scientist at the University of Colorado, an Instructor at Humboldt State University, and a Project Manager at Environmental Research Consultants in California. He received his PhD in Chemical Oceanography from Oregon State University, an M.S. from Humboldt State University, and a B.A. at UC Santa Barbara.