After a National Research Council–National Bureau of Standard postdoctoral position at the Joint Institute for Laboratory Astrophysics in Colorado, John joined the technical staff at Sandia National Laboratories in Livermore, CA (where he has been ever since). He initially developed laser-based combustion diagnostics. After a decade in that field, John transitioned into laser-based remote sensing, where (among other projects) he built a Raman lidar for profiling atmospheric water vapor that has now been operational at a climate-study site in Oklahoma for 16 years. He then joined the Extreme Ultraviolet Lithography (EUVL) program at Sandia, where he transitioned from technical staff into management. After a decade managing a variety of technical projects, John chose to transition back into technical work. He built a second Raman lidar, which has now been operational in Darwin, Australia for over a year. His current activities include leading the development of a more compact version of the Sandia Neutron Scatter Camera for emergency response use, implementing infrared laser probe techniques for studying the optical response of nanostructures, and helping maintain (and occasionally upgrade) the two Raman lidar systems. John received a Ph.D. in physics from Stanford University, where he specialized in high-resolution laser spectroscopy.