Gregory Frost is a Research Chemist at NOAA’s Chemical Sciences Laboratory in Boulder, Colorado, USA. After receiving a PhD in physical chemistry from the University of Colorado (CU) at Boulder in 1995, he started work at NOAA as a National Research Council postdoctoral fellow. From 1997 to 2014, Frost was also a Research Scientist with CU’s Cooperative Institute for Research in Environmental Sciences. Frost’s research uses atmospheric observations and modeling to understand emissions and tropospheric chemistry and their impacts on air quality and climate change.

Dr. Christian GEORGE (Ph. D. in the field of Physical-Chemistry - 1993, Habilitation in Chemistry - 1999, University Louis Pasteur - Strasbourg) has been active in the field of atmospheric chemistry and/or physical chemistry over the last decade. He acted as research scientist at the Fraunhofer Institute ITA at Hanover (Germany), at the CNRS Centre for Surface Geochemistry at Strasbourg (France) and now at CNRS-IRCELYON (France). Especially, he actively participated to projects focused on understanding multiphase transformation in the atmosphere.