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 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 Alaska, Hawaii, Antarctica, Norway, Sweden, Spitsbergen, New Zealand, Mexico, Chile, South Korea, and the U.S. Virgin Islands.  For more details, see
Google Scholar,, and ResearchGate. After shuffling between a half-dozen temporary labs on and off campus since 1999, in April of 2016 we completed a move into permanent space at the new Sustainability, Energy, and Environment Complex (SEEC) on East Campus. We are still unpacking boxes and setting up equipment that has been in storage for over 15 years!

This year we completed a series of successful measurements of condensed water contents and aerosol residuals from the NCAR Gulfstream-V during the ARISTO 2017 aircraft campaign based in Broomfield, CO, and we built a new counterflow virtual impactor (CVI) inlet that just completed a series of flights on the NASA P-3 aircraft during ORACLES. Next year we will be traveling to Hobart, Tasmania, for the SOCRATES campaign, measuring condensed water contents and aerosol residuals in cloud droplets from the NSF G-V aircraft, and we will be supporting the NCAR CVI inlet for the WE-CAN C-130 aircraft deployment in Boise, ID, later in the summer. These missions will study the properties of clouds and aerosols from remote to highly aerosol-impacted regions. I will be on sabbatical in 2018-2019 working on some long-overdue papers on these and previous field campaigns, and preparing proposals for 2020 and beyond for some new and exciting projects related to low-cost, highly portable laser-spectroscopic instruments.

I have been teaching in the classroom since 1980, when I was the instructor for a laboratory class in experimental physics for non-science majors at Cal State Fullerton. Since then, I have taught 25 different courses in fields ranging from fundamental physics and chemistry, to global ecology, sustainability, and science policy. Many of these courses were developed and taught for the first time.
I am currently teaching "ATOC 1060: Our Changing Environment", the class I have taught the most, this being my tenth offering.

I have been involved in a wide variety of service activities at CU. Between 2005 and 2017 I served as faculty director for three residential academic programs, most recently a sustainability-themed program housed in Williams Village North, the first LEED platinum residence hall at CU Boulder. Unfortunately, this Ashoka Award-winning program was suspended in 2017 while the campus undergoes a thorough review of first year experiences.

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 on the use of observations to address resilience and disaster response. Following that year of service, from 2013 to 2015 I helped develop sucessful proposals for hosting a hub of the Future Earth Secretariat in the United States and for linking educators and researchers in Colorado and in the United States working in the fields of sustainability and global development. 

Maybe of further 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 Sept 28, 2017