John F. O’Hanlon is Emeritus Professor of Electrical and Computer Engineering, The University of Arizona. He retired from IBM Research Division in 1987, where he was involved in thin-film deposition, vacuum processing, and display technology. He retired from UA in 2002, where he directed the NSF Ind./Univ. Center for Microcontamination Control. His research focused on particles in plasmas, cleanrooms, and ultra-pure water contamination. He and Tim Gessert are co-authors of “A Users Guide to Vacuum Technology”, 4th Edition, John Wiley and Sons, 2023.