Stanton Friedman is convinced that extraterrestrial aliens are visiting us, and have been for a long time. There's nothing odd about that; many people believe in UFOs and aliens.

But Friedman is not your typical tin foil-hatted UFO nut. For one thing, he has a Master's degree in nuclear physics and worked for decades on fusion and fission rockets for some of the world's top aerospace companies.
Friedman joins other famous people with advanced degrees who are firmly convinced about things for which there is little hard evidence. Former Apollo astronaut Edgar Mitchell, for example, shares Friedman's beliefs about UFOs and alien cover-ups (Mitchell admits that he never saw any UFOs during his time with NASA, but believes that in 1947 Roswell, New Mexico, “There was a UFO crash. There was an alien spacecraft”).
Another respected UFO believer was the late Harvard psychiatrist John Mack, who spent years studying people allegedly abducted, probed, and experimented upon by aliens.
Friedman has cultivated an image of a maverick, a renegade scientist brave enough to tell the world what he knows about flying saucers.
He has spent the last half-century researching UFO claims, and his conclusion is that “Some UFOs are intelligently controlled extraterrestrial spacecraft, and this is the biggest story of the millennium … I'm convinced we're dealing here with a cosmic Watergate,” he told AOL News this week. “A few people within major governments have known since at least 1947 that some UFOs are alien spacecraft.”
According to Friedman, there are two main reasons that the hard evidence of alien presence is not better known:
The first is that a decades-long global conspiracy is afoot; high-ranking officials have carefully covered up all the hard evidence of UFOs. The second that scientists who are in a position to help expose the truth are afraid-not just of those enforcing the conspiracy, but of admitting they were wrong. Friedman believes that the real truth about UFOs will be revealed soon.
(Source: LiveScience.com)