Video of the “alien contact” session held by Dr Steven Greer shows the appearance of one, and then a second, orange, glowing ball of light above the ocean at Vero Beach, Florida.
Mr Greer, a former medical doctor, has been at the heart of a disclosure project to try to get the US Government to release all files it has on aliens and UFOs and admit that aliens have visited Earth.
In 2001 he helped organise congressional hearings that brought several witness before congress to debate the issue.
He also founded the Center for the Study of Extraterrestrial Intelligence (CSETI), said to be an “international scientific research and education organization dedicated to the furtherance of our understanding of extraterrestrial intelligence.”
Mr Greer, who claims he can get alien craft to appear by meditating, tells the group the two objects contained “beings on board them” and that they are communicating with them.
In the footage the two orbs are there for several minutes, before one and the the other disappear.
Video subtitles described it as “extraterrestrial contact captured during an advanced consciousness training”
Mr Greer claims to use “coherent thought” and “meditation practices” to summon aliens to appear – something he calls CE-5 protocols.
He has previously claimed during a UFO seminar to have taken part in a similar session to contact aliens with serving members of the French Ministry of Defence.
The French MoD refused to comment to Express.co.uk on his claims.
In the video he says to the group of students, who are being taught the alleged technique: “What is that orange object – oh my God. Wow.
“You see that colour?”
Someone asks if it is just a flare, but he replies: “Oh no, no. Thank them for coming.
“Oh here they come, there are two look at this how gorgeous.
“I’m looking at the night scope and there is no smoke, no trails – these are not flares.
“Let’s welcome them here.”
Mr Greer mixes his alleged techniques with new age practices.
He adds in the video: “Connect to them in your consciousness and invite them here.
“These are the golden ones I talked about… lets welcome the beings on board to join us in meditation.
‘It is such a beautiful colour, you will never forget that colour.
“Yeah this is a major event, so we are grateful, so open your heart, your chakra and send them the beauty of humanity.
“Connect with your palms out, and third eye, and heart and make like a tetrahedron radiating our pureness and love towards them.
“Let’s invite them to come as close as they can.”
Mr Greer claimed the “UFOs” emerged from the sky to hover above the ocean, before one disappeared and the other “dropped into the sea”.
Scott Brando, who runs hoax-busting website ufoofinterest.org, said the so-called UFOs over Vero Beach has been debunked.
He pointed to a thread on Reddit by user Solarslave which said: “There was a massive naval training exercise known as COMPTUEX involving hundreds of aircraft, dozens of ships and thousands of sailors and marines going on off the coast of Florida, including Vero Beach at the time of Greer’s “UFO summoning” event.
“These training exercises included flares and live fire. Case closed. Nice try Greer.”
Mr Brando, also provided a link to a YouTube video showing such military lights going off.
He said: “Those lights were artillery illumination rounds related to a naval exercise known as COMPTUEX with aircrafts and ships going on off the coast of Florida, including Vero Beach.
“Mr Greer is known in our UFO Community for his sensational claims, but he never produced any evidence to back anything up.”