John H. Seinfeld

John H. Seinfeld is the Louis E. Nohl Professor of Chemical Engineering at the California Institute of Technology (Caltech). He holds a dual affiliation with the Division of Engineering and Applied Science and has served in various administrative roles, including Executive Officer for Chemical Engineering (1974-1990) and Chair of the Division of Engineering and Applied Science (1990-2000). His research focuses on atmospheric chemistry and physics, particularly aerosols, their formation, evolution, and impact on climate and air quality.

• B.S., University of Rochester (1964)
• Ph.D., Princeton University (1967)
• Honorary Doctorates from University of Patras, Carnegie Mellon University, and Clarkson University

His work spans laboratory chamber studies of organic aerosols, airborne field measurements of atmospheric particles and clouds, and large-scale modeling of air quality and climate. He has developed critical frameworks for understanding aerosol dynamics in urban to global scales, emphasizing the role of organic components in atmospheric processes.

Seinfeld teaches graduate and undergraduate courses at Caltech, including ChE 105 (Dynamics and Control of Chemical Systems), ESE/ChE 158 (Aerosol Physics and Chemistry), and ESE/Ge/Ch 172 (Atmospheric Chemistry II). His office is located in 206 Spalding Laboratory, and he is supported by assistant Matt Buga.