Dr. Josef Allen Hynek ( May 1, 1910 - April 27, 1986 ) was Chairman of Department of Astronomy Northwestern University , professor, and ufologist. He is perhaps best remembered for his UFO research. Hynek acted as scientific adviser to UFO studies undertaken by the U.S. Air Force under three consecutive names: Project Sign (1947-1949), Project Grudge (1949-1952), and Project Blue Book (1952 to 1969). For decades afterwards, he conducted his own independent UFO research, and is widely considered the father of the concept of scientific analysis of both reports and, especially, trace evidence purportedly left by UFOs. Also his book called The Ufo's Experience a Scientific Inquiry 1972