Dr. Christopher M. Sims is a Research Chemist in the Materials Science and Engineering Division at the National Institute of Standards and Technology (NIST). He received a B.S. in Chemistry from the University of Maryland, Baltimore County (UMBC), where he was a Meyerhoff Scholar and a Ph.D. in Materials Chemistry from the University of Maryland, College Park, where he was a Dolphus E. Milligan Graduate Fellow. With a background in nanomaterial synthesis and characterization, he joined NIST as a National Research Council Postdoctoral Research Associate, where his research focused on the development of new methods for measuring the physicochemical properties of engineered nanomaterials and understanding how these physicochemical properties influence nanomaterial interactions with biological and environmental systems. His current research involves the development of measurement methods and technologies to enable and improve commerce of dispersed objects such as nanoparticles, colloids, and biomolecules, with a specific focus on single-wall carbon nanotubes (SWCNTs).