Dr. Ann Debay of the NIST Material Measurement Laboratory has had remarkable successes in measuring the atomic makeup of advanced materials that are at the core of many of our Nation’s cutting-edge and established industries. Her research involves the novel use of electrons and ions to measure and understand atoms in solid substances. This is the key to predicting, designing, and controlling the physical properties that materials exhibit. She has focused on two primary areas: in situ measurement of material properties in the transmission electron microscope and precision measurement of atom species and locations by atom probe tomography.