Dr. Steven Greer is an American physician and ufologist known for his work in the field of extraterrestrial life and unidentified flying objects (UFOs). He founded the Center for the Study of Extraterrestrial Intelligence (CSETI) in 1990, which aims to promote peaceful contact with extraterrestrial civilizations. Greer is also the creator of the Disclosure Project, an initiative that seeks to disclose classified information related to UFOs and government involvement. He has authored several books and produced documentaries, advocating for transparency regarding UFOs and the potential for advanced technologies that could benefit humanity.