A Stanford University professor and prominent ufologist says he 100 percent" believes extraterrestrials have not only visited Earth " but have "been here a long time" and may even still be on the planet today. Dr. Garry Nolan, a professor of pathology at Stanford's medical school, made the stunning claim during last week's Salt iConnections conference in Manhattan at a session titled, "The Pentagon, Extraterrestrial Intelligence and Crashed UFOS." Moderator Alex Klokus asked Nolan if he believes extraterrestrial life has visited Earth, and the prof replied, "I think you can go a step further " it hasn't just visited, it's been here a long time, and it's still here." "You know, people talk about the 'Wow! signal' looking for extraterrestrial intelligence. The 'Wow! signal' is that people see it on an almost regular basis, that's the communication that's already here," Nolan said. The "Wow! signal' refers to a burst of radio waves captured from outer space in 1977. The signal was 30 times stronger than typical background radiation and prompted some astronomers to believe it may have come from aliens. Klokus noted that for many, Nolan's statement about alien life would be "tough to believe" and asked him to assign a probability to his claims. "One hundred percent," Nolan said. "And that's not just my opinion. Thirty pages of [the National Defense Authorization Act] is the establishment of an unidentified aerial phenomena office."