Mark Johnson

Mark Johnson is an experienced engineer specializing in nuclear radiation shielding, currently serving as Engineer III at X-energy since September 2023. In this role, Mark performs radiation shielding analyses for the Xe-100 pebble bed high-temperature gas-cooled reactor and develops detailed radiation transport models using tools such as MCNP, ADVANTG, and ORIGEN. Prior experience includes serving as Nuclear Engineer at SHINE Technologies, where responsibilities encompassed waste processing systems, radiological dose analyses, and technical expertise in safety evaluations. Mark also has experience as a Radiation Technician at PERMA-FIX OF FLORIDA, INC., and has worked as an AutoCAD designer and drafter for Formica & Associates Consulting Engineers. Mark holds a Bachelor's degree in Nuclear Engineering from the University of Florida.