Sir Prof. Ole John Nielsen, Department of Chemistry, University of Copenhagen. Currently works at the Department of Chemistry, University of Copenhagen, as Professor in atmospheric chemistry. He is teaching air pollution and health, environmental chemistry, atmospheric chemistry and climate change impacts adaptation and mitigation (CCIAM). Sir. Prof. Nielsen was previously the head of the atmospheric chemistry department at Risø National Laboratory from 1990 until 1997. Between April 1995 and August 1996, he worked at Ford Research Center Aachen (Germany) as leader of atmospheric science. Along more than 40 years of experience, Nielsen has always been interested in atmospheric chemistry with focus on laboratory investigations. His main focus remains environmental impact of alternative CFCs, alternative fuels and more climate friendly chemical compounds. From 1998 to 1999, he was the coordinator of the EU project, HALOBUD, which provided reliable scientific data concerning the fate of halogenated compounds in the atmosphere and the possibility of formation of organo-halogen compounds, including halo-acetic acids, by degradation of hydrocarbons of biogenic origin. Moreover, he has had an on-going collaboration with Ford Motor Company since 1987 on alternative fuels, prevention of particle/soot formation and general atmospheric chemistry. He has 245 Peer-reviewed publications, 17 book chapters, 27 reports, 114 popular writings and interviews, +6000 citations and an H-index of 41. He supervised 25 PhD students and gives approximately 20 presentations per year. One career highlight is certainly his work for the IPCC (Intergovernmental Panel for Climate Change) and being a member of the team that received the 2007 Nobel Peace Prize. He also received the Henry Ford Technology Award in 1996. Ole John Nielsen has been member of the Royal Danish Academy of Sciences and Letters since 2008