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Among Schaefer's most successful ventures via the ASRC was the Yellowstone Field Expeditions. In 1960, Schaefer met with National Park Service members in Wyoming's Grand Tetons to discuss the possibility of leading scientific studies in Yellowstone National Park. Specifically, he was interested in the behavior of supercooled clouds that form in the area of Old Faithful. Clouds and condensation nuclei were still a fascination of Schaefer's long after his G.E. days, and he foresaw many different kinds of scientists—including cloud physicists—gathering at Yellowstone once a year to devote themselves to conducting experiments, making observations, and comparing outcomes.