Nick Pope, worked for the MOD, and is an expert on UFO sightings
Extra terrestrial life and UFOs will be the focus as the University of Leeds hosts the the International Exopolitics conference.
The two-day event includes speakers from the UK, the United States and Australia.
Former Ministry of Defence employee, Nick Pope is speaking at the event.
The conference is organised by Anthony Beckett from Keighley for those interested in the field of UFOs and space exploration.
Exopolitics has been defined as "the art or science of government as concerned with... influencing governmental policy towards extraterrestrial phenomena and extraterrestrial beings"
Nick Pope, who used to investigate UFO sightings for the MoD, is one of the speakers headlining the conference.
He will be speaking about one of the UK's most celebrated UFO events, the Rendlesham Forest incident. It took place in December 1980 over several nights when personnel at the twin bases of RAF Bentwaters and RAF Woodbridge went to investigate 'lights' in the nearby woods.
Some military personnel claimed to have seen a triangular-shaped craft on the ground. Nick Pope later undertook a review of the incident for the MOD but the case remains unexplained.
Another guest is Gary Heseltine a serving police officer who has founded a database for reported sightings of UFO by other police officers.
Anthony Beckett says: "There is a growing belief that there really is something going on in our skies that quite possibly is extra-terrestrial visitation. But if it isn't ET then the other rational conclusion is that UFOs are military in origin."
Interest in governmental disclosure of UFO evidence has been in the news. The latest batch of UFO files has been released from the Ministry of Defence to the National Archives.
Files released in August 2010 contain a wide range of UFO-related documents, drawings, letters and parliamentary questions covering the years 1995-2003.