My research addresses the role of trace gases and aerosols on climate, atmospheric oxidation, and air quality. We develop instruments for fast-response in situ measurements from the ground, balloons, and aircraft.  We have participated in  more than  50 field campaigns over three decades to examine topics such as stratospheric ozone depletion over the Arctic, the impact of rockets on stratospheric chemistry, long-range transport of pollutants, and the role of aerosols in modification of cloud properties. In addition to many sites throughout the continental United States, we have conducted work in Antarctica, Spitsbergen, New Zealand, Mexico, Sweden, the U.S. Virgin Islands, Alaska, and Hawaii.  For more details, see
Google Scholar,, and ResearchGate. After shuffling between a half-dozen temporary labs on and off campus since 1999, we moved into a permanent lab at the new Sustainability, Energy, and Environment Complex (SEEC) on East Campus in March of this year. In 2016 we completed a series of successful measurements of condensed water contents from the NCAR Gulfstream-V on the ORCAS field campaign based in Punta Arenas, Chile, and on the NASA DC-8 on the KORUS-AQ campaign based in South Korea. In March 2017 we completed the ARISTO 2017 aircraft campaign based in Broomfield CO. We have just received new funding for the SOCRATES campaign that will be based in Hobart, Tasmania (January-February 2018), and the WE-CAN campaign to be based in Boise, ID (August-September 2018). These missions will study the properties of clouds and aerosols from remote to highly aerosol-impacted regions. In 2018 and 2019 I will be on sabbatical, hoping to finish up some long-overdue papers and preparing for some new projects in 2020 and beyond.

I have been teaching in the classroom since 1980, when I was instructor for a laboratory class in experimental physics for non-science majors. Since then, I have taught 25 different courses in fields ranging from fundamental physics to global ecology. Many of these courses were developed and taught for the first time.

In Fall 2017 I will be teaching "ATOC 1060: Our Changing Environment".

I have been involved in a wide variety of service activities at CU. I am presently finishing up a term as director of the Sustainability and Social Innovation Residential Academic Program (SSI RAP) located at William Village North, the first LEED platinum residence hall at CU Boulder. Unfortunately, this Ashoka Award-winning program was inexplicably more here.

Science Policy
In 2011-2012, I served as a Jefferson Science Fellow at the U.S. Department of State in the Bureau of East Asian and Pacific Affairs, working on issues related to energy and green growth for APEC
. I organized a high-level meeting on Open Governance and Economic Growth, chaired by the Secretary of State, served as a delegate for the United States at the 10th APEC Energy Ministerial Meeting, and organized an APEC Workshop in Singapore. Since returning to CU, I have helped develop proposals for hosting a hub of the Future Earth Secretariat in the United States and for linking educators and researchers at CU working in the fields of sustainability and global development. I am indebted to Ralph Cicerone for advice he offered throughout this process. Please read  Mario Molina's recent tribute to Ralph Cicerone.

And, maybe some of this will be of interest!
Photo: 2011 Jefferson Science Fellows
Read: 2014 Jefferson Science Fellowship brochure
Read:  My Year as a Jefferson Science Fellow

Watch: Understanding Climate Change and the Redistribution of Heat, Winds, Water, and Worries (U.S. Center, Doha Conference, November 2012) 
Watch: The Canary in the Coal Mine: Why the Stratosphere is Still Relevant (U.S. Dept. of State, April 2012)

This page was last updated March 31, 2017