Philip Stevens

Philip S. Stevens is the Rudy Professor in both the Department of Chemistry and the O'Neill School of Public and Environmental Affairs at Indiana University Bloomington, where he also serves as Associate Dean for Faculty Affairs. He earned a B.A. in chemistry from Oberlin College in 1984, an A.M. in chemistry from Harvard University in 1986, and a Ph.D. in physical chemistry from Harvard University in 1990 under the direction of Professor James G. Anderson. Prior to joining Indiana University in 1995, Stevens was a postdoctoral research associate in atmospheric chemistry at The Pennsylvania State University, working with Professor William H. Brune on instrumentation for measuring atmospheric free radicals. At Indiana University, he has held the position of Rudy Professor and formerly chaired the Environmental Science Faculty Group. Stevens previously served as a member of the Indiana Air Pollution Control Board from 2000 to 2012.

Stevens's research centers on atmospheric chemistry, with a focus on the chemical mechanisms that influence indoor air quality, regional air quality, and global climate change. His laboratory conducts studies on the kinetics of atmospheric reactions, theoretical analyses of reaction mechanisms, and field measurements in urban and forested environments to elucidate the impact of biogenic emissions and their oxidation products. He has secured funding from NASA, the National Science Foundation, the Camille and Henry Dreyfus Foundation, and the Sloan Foundation. Notable awards include the NSF CAREER Award, the Sloan Foundation grant in 2018, and the Indiana University Trustees Teaching Award in 2006. Key publications encompass 'An overview of the MILAGRO 2006 Campaign: Mexico City emissions and their transport and transformation' (2010, 431 citations), 'Organic aerosol composition and sources in Pasadena, California, during the 2010 CalNex campaign' (2013, 304 citations), 'Overview of HOMEChem: house observations of microbial and environmental chemistry' (2019, 276 citations), 'Re-assessing hydroxyl radical chemistry in the atmosphere: Instrument interferences may explain previous measurement discrepancies' (2025), and 'Dynamics of nanocluster aerosol in the indoor atmosphere during gas cooking' (2024). As a leading scholar in atmospheric chemistry, Stevens's work guides policymakers and regulators in improving air quality and mitigating climate change.