Candidate must have a professional background in one of the key nonproliferation domains Chemical, Biological, Radiological, and/or nuclear Counterproliferation, Epidemiology, Emerging Infectious Disease, Public Health, Biodefense, Border Security, Nuclear Security, International Security, Weapons of Mass Destruction or a related field. The subject matter expert will support an overseas capacity-building assessment program, partnering with the Assessment Lead and the broader team to design, execute, and report on independent evaluations that support national‑level strategy, treaty compliance, and counter‑proliferation objectives.