Peter H. McMurry is the Kenneth T. Whitby Professor of Mechanical Engineering at the University of Minnesota, where he has served as Department Head since 1977. He is a past President of the American Association for Aerosol Research. His research focuses on phenomena including nucleation, growth, water uptake, and light scattering. With his research colleagues he has developed a condensation nucleus counter to detect particles as small as 3 nm, aerodynamic lenses to produce tightly collimated particle beams, and instruments to measure particle properties that include density, refractive index,...