Donald Hillger, research scientist, is president of the U.S. Metric Association and a National Oceanic and Atmospheric Administration (NOAA) meteorologist stationed at the Cooperative Institute for Research in the Atmosphere at Colorado State University. He’s also a philatelist with numerous publications on postage stamps, the metric system, and amateur radio. Hillger has a bachelor’s degree in physics, and a master’s degree and Ph.D. in atmospheric science. Hillger specializes in satellite meteorology from geostationary and polar-orbiting platforms, as well as satellite instrument calibration/validation, satellite data/image quality, and planning for advanced and future instrumentation.