This position is part of the NIST Professional Research Experience Program (PREP), supporting collaborative scientific research with academic institutions. The Senior Researcher will lead microwave and RF measurements, working closely with NIST, industry, government labs, and universities. Responsibilities include publishing in peer-reviewed journals, presenting at conferences, mentoring students, and preparing reports. The role requires expertise in electromagnetic measurements, scientific computing (e.g., MATLAB, Python), and RF device characterization. A PhD in electrical engineering, physics, or related fields is required, along with experience in RF measurement, uncertainty analysis, statistical analysis, and electromagnetic simulation. U.S. citizenship is preferred. The position emphasizes strong communication skills, laboratory safety, and collaboration within a multidisciplinary environment.