Climate change: Current and projected impacts on the United States, SOLAR 2018: Pathways to the Renewable Energy Transformation, American Solar Energy Society (ASES), University of Colorado, Boulder, CO, 6 August 2018.
Earth observations & modeling for decision making, Making Assessments for Policy for Environmental Research Scientist (MAPERS), NERC Advance Training Short course, University of Leeds, Leeds, UK, 18-20 September 2017.
Science Saves: Atmospheric research in support of wildfire management, House Earth & Space Science Caucus, Rayburn House Office Building, Washington, DC, 14 September 2017.
Messing with stratospheric chemistry: What's at stake, Geoengineering Gordon Research Conference, Newry, Maine, 23-27 July 2017.
Earth observations & modeling for decision making, International Global Atmospheric Chemistry (IGAC) Science Conference, Breckenridge, Colorado, 30 September 2016.
The role of the Montreal Protocol in protecting present and future climate: A scientific perspective, ATOC4088/5000: Policy implications of climate/Critical issues in climate and the environment, Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, 5 March 2015.
Pursuing climate science: From small particles to large airplanes, Advanced Studies, Program, National Center for Atmospheric Research, Boulder, CO, 15 September 2014.
Reflections on aerosols and climate and the future, Keynote Address, AeroCom Workshop, Steamboat Springs, CO, 29 September 2014.
Contributing to the Climate Change Building: A scientist-to-scientist perspective, National Institute for Standards and Technology, Boulder, CO, 11 June 2014.
The NASA ATTREX Mission: Demonstrating the Global Hawk Unmanned Aircraft System (UAS) for Earth science research, Forschungszentrum Jülich GmbH, Jülich, Germany, 30 June 2014.
Bioaerosol research at CSD: One year of laboratory and field measurements, Max Planck Institute for Chemistry - Mainz, Mainz, Germany, 3 July 2014.
A climate science perspective, Science and Public Policy Class, CU Physics Dept. 29 October 2013.
Assessing the role of black carbon in the climate system: An important challenge and template for the future, ACCENT-Plus Symposium, Atmospheric Composition Change: the European Network - Policy Support and Science, Urbino, Italy, 17-20 September 2013.
The role of the Montreal Protocol in protecting present and future climate: A scientific perspective, Delft University of Technology | TU Delft, Climate Institute and Department of Philosophy, The Netherlands, 23 September 2013.
Pursuing climate science: From small particles to large airplanes, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, UK, 27 September 2013.
Assessing the role of black carbon in the climate system: An important challenge and template for the future, Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands, 24 September 2013.
The NASA ATTREX Mission: Demonstrating the Global Hawk Unmanned Aircraft System (UAS) for Earth science research, Kirchhoff Institute for Physics, University of Heidelberg, Heidelberg, Germany, 19 April 2013.
Black carbon observations during the HIPPO campaign, Fall American Geophysical Union Meeting, San Francisco, CA, 5 December 2012.
Airborne exploration of the changing atmosphere at the 50th Anniversary of the DLR Institute of Atmospheric Physics, Institute of Atmospheric Physics, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany, 29 June 2012.
Ozone Depletion and Climate Change, Café Scientifique - Public science lecture, Denver, Colorado, 26 March 2012.