Daniel Barker is a physicist in the Thermodynamic Metrology Group in the Sensor Science Division. He received a B.A. in Physics from Goucher College and a Ph.D. in atomic, molecular, and optical physics from the University of Maryland, where he studied quantum degenerate gases of alkaline-earth elements. Daniel came to NIST as a National Research Council Postdoctoral Research Associate to develop primary vacuum sensors under the Cold Core Technology program. Since joining the NIST staff, his research has focused on developing chip-scale sensors based on laser-cooled atoms or optomechanical systems, particularly for temperature and pressure metrology.