The Aerial Phenomena Research Organization (APRO) was a
UFO research group started in 1952 by Jim and Coral Lorenzen. The group, which was based in Tucson, Arizona but had many state branches, remained active until 1988. APRO stressed scientific field investigations, and had a large staff of consulting
Ph.D. scientists. A notable example was Dr.
James E. McDonald of the University of Arizona, a well-known atmospheric physicist, and perhaps the leading scientific UFO researcher of his time. Another was Dr.
James Harder of the
University of California, Berkeley, a civil and hydraulic engineering professor, who acted as director of research from 1969-1982. McDonald and Harder were among six scientists who testified about UFOs before the U.S. House of Representatives Committee on Science and Astronautics in 1968, when they were conducting hearings on the subject.
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