accounts of unidentified flying objects and alien abductions). Dean Appelle was a member of nine professional organizations including the American Psychological Association, the American Psychological Society, Psychonomic Society, and the Society for Clinical and Experimental Hypnosis.
Dean Appelle contributed to discussions about mysterious aerial events and reported cases of extraterrestrial encounters. As a member of various psychological organizations, he shared his expertise with colleagues in fields like hypnosis and experimental psychology.