Josef Allen Hynek (May 1, 1910 – April 27, 1986) was an American astronomer, professor, and ufologist. He is perhaps best remembered for his UFO research. Hynek acted as scientific advisor to UFO studies undertaken by the U.S. Air Force under three projects: Project Sign (1947–1949), Project Grudge (1949–1951) and Project Blue Book (1952–1969). In later years, he conducted his own independent UFO research, developing the "Close Encounter" classification system. He was among the first people to conduct scientific analysis of reports and especially of trace evidence purportedly left by UFOs. Early life Hynek was born in Chicago to Czech parents. In 1931, Hynek received a Bachelor of Science degree from the University of Chicago. In 1935, he completed his PhD in astrophysics at Yerkes Observatory of the Department of Astronomy and Astrophysics at the University of Chicago. His thesis advisors were Otto Struve and William Wilson Morgan. Hynek joined the Department of Physics and Astronomy at Ohio State University in 1936. He wrote with George Gamow on the origin of the solar system in 1945. He specialized in the study of stellar evolution and in the identification of spectroscopic binary stars. Career During World War II, Hynek was a civilian scientist at the Johns Hopkins Applied Physics Laboratory, where he helped to develop the United States Navy's radio proximity fuze. After the war, Hynek returned to the Department of Physics and Astronomy at Ohio State, rising to full professor in 1950. In 1953, Hynek submitted a report on the fluctuations in the brightness and color of starlight and daylight, with an emphasis on daytime observations. In 1956, he left to join Professor Fred Whipple, the Harvard astronomer, at the Smithsonian Astrophysical Observatory, which had combined with the Harvard Observatory at Harvard. Hynek had the assignment of directing the tracking of an American space satellite, a project for the International Geophysical Year in 1956 and thereafter. In addition to over 200 teams of amateur scientists around the world that were part of Operation Moonwatch, there were also 12 photographic Baker-Nunn stations. A special camera was devised for the task and a prototype was built and tested and then stripped apart again when, on Oct. 4, 1957, the Soviet Union launched its first satellite, Sputnik 1. After completing his work on the satellite program, Hynek went back to teaching, taking the position of professor and chairman of the astronomy department at