A Stanford professor who has researched unidentified aerial phenomena for the US government says he believes extraterrestrial intelligence has not only visited earth but “it’s been here a long time and it’s still here”.

Dr Garry Nolan also claimed that whistleblowers who have worked on “reverse-engineering downed craft” had recently given classified testimony to Congress, creating a “hornet’s nest in Washington”.

Dr Nolan, a Professor of Pathology at Stanford University School of Medicine who has published more than 300 research articles and holds 40 US patents, made the bombshell comments during a talk at the Salt iConnections conference in New York on Thursday titled “The Pentagon, Extraterrestrial Intelligence and Crashed UFOs”.

The respected researcher is one of the most accomplished scientists publicly studying the phenomenon, including by analysing the brains of people who say they’ve experienced a UFO encounter.

During the session, moderator Alex Klokus, founder and managing partner of Salt Fund, asked Dr Nolan, “Do you believe that extraterrestrial intelligence has visited planet earth?”

“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,” Dr Nolan replied.

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