Jeff Sherman is a Supervisory Physicist at the National Institute of Standards and Technology. Jeff works to maintain and improve NIST systems that produce and distribute official U.S. time, time-interval, and frequency signals, which are based on an ensemble of atomic clocks and frequency references. Jeff’s research career has centered around high-precision measurements in optical-atomic systems and includes a Ph.D. in Physics from the University of Washington (2007), postdoctoral work at the University of Oxford, and a National Research Council research associateship at NIST.