George began his career as a Postdoctoral Fellow in Radiology at the Canadian National Research Council in Ottawa, followed by a 10-year stretch as a Scientific Officer with the Canadian Defence Research Establishment in Ottawa and Churchill, interrupted by a 2-year appointment as an Associate Professor of Geophysical Research at the University of Alaska's Geophysical Institute in Fairbanks.
In 1963 he came to the Central Radio Propagation Lab of the National Bureau of Standards in Boulder, and as the organization changed its acronym through ITSA, ESSA and finally NOAA, he migrated through the Space Environment Lab and the Aeronomy Lab, where he occupied various research and administrative positions. He became one of the four initial founding Fellows of CIRES in 1968, when he was briefly an Adjunct Professor in the Astro-Geophysics Department of the University of Colorado. He also had short-term appointments as an Adjunct Professor and as a Special Member of the Graduate Faculty of Colorado State University.
He retired from Government service in 1998, and continued to work in CIRES for several years, finally returning to a position in NOAA as a Scientist Emeritus.