John Dykema is a Project Scientist in the Harvard John A. Paulson School of Engineering and Applied Sciences. He focuses on the development of instrumentation (particularly infrared remote sensing systems) and validation of long-term data records for atmospheric model testing applications. From this perspective, quantitatively testing model performance in simulating geoengineering impacts provides a new set of observational challenges. Recent work has assessed the measurement requirements necessary to empirically quantify the risk of ozone loss posed by geoengineering through improved understanding of stratospheric chemistry and dynamics. He holds a Ph.D. in Applied Physics from Harvard University.