John Podesta - White House Chief of Staff to President Barack Obama - White House Staffer to Bill Clinton - Campaign Chairman to Hillary Clinton
John Podesta has been an advocate of disclosure to the American People about the UFO or UAP phenomena for years. When leaving President Obama's office, he made it clear via a Twitter post that he was disappointed in himself for not being able to bring the UFO documents from the White House to the American public. In the recent Wikileaks e-mail leaks, John Podesta had some exchanges with Tom DeLonge citing the release of information surrounding UFO information. https://www.washingtontimes.com/news/2016/oct/16/john-podesta-emails-encourage-ufo-buffs-seeking-de/
Hillary Clinton
Hillary Clinton has been trying to push disclosure over the course of her career. She and Bill were involved in the Rockefeller Initiative with the help of billionaire philanthropist, Laurence Rockefeller. https://www.washingtontimes.com/news/2016/oct/16/john-podesta-emails-encourage-ufo-buffs-seeking-de/. She was on the Jimmy Kimmel show during her 2016 presidential campaign discussing the UAP phenomena.
Gordon Cooper - Project Mercury Astronaut - Aerospace Engineer - Test Pilot
Gordon Cooper made many mentions of encountering both alien aircraft and alien humanoids throughout the course of his career. I personally put a lot of stake in the claims of astronauts since they are some of the smartest and most clear minded individuals in our society (or our parents and grandparents society). http://www.theblackvault.com/casefiles/astronaut-gordon-cooper-admitted-that-alien-craft-are-visiting-earth/#
Edgar Mitchell - American Astronaut - Test Pilot - Aeronautical Engineer - Apollo 14 Astronaut - 6th Man to Walk on the Moon
"We are not alone in the universe. They have been coming here for a long time..". Edgar Mitchell has been to the moon and has spent some time in space. He was a believer in alien visitors and I would not want to argue with him about what he experienced or saw.
Robert Bigelow - Founder of Bigelow Aerospace
Robert Bigelow owns BAASS which happens to be the company that is currently the company for commercial pilots to report their UFO sightings to. The FAA handbook currently lists BAASS as the agency that should be contacted in the event of a UFO sighting during flight https://gizmodo.com/5430338/federal-aviation-administration-officially-says-who-to-call-after-ufo-contact.
He believes in aliens and there is no reason to doubt him or his credibility
Paul Hellyer - Canadian Engineer - Politician - Canadian Ministry of Defense
Paul Hellyer was a member of the Canadian government for many of his professional years. He claims to have had many colleagues reach out to him about the UFO and alien topic. Once he stepped down, he started to be heavily involved with the topic. He claims to have had high level contacts within the Canadian and American government who have informed him of many aspects of the topic.
Ben Rich - Second Director of Lockheed Skunkworks - "The Father of Stealth"
https://www.bing.com/videos/search?q=ben+rich&docid=607995576889444745&mid=964D07AE81F8BEACA7AD964D07AE81F8BEACA7AD&view=detail&FORM=VIRE
Ben Rich ran a military contractor that is lightyears ahead of the public. On his deathbed, he has been rumored to say "We now have the technology to take ET home". Take that for what you will, but I believe that is very telling.
There are many more officials, presidents and celebrity stories out there surrounding the UFO and alien topics that are not mentioned here. This is a beginner's list that leads to an abundant list of prominent individuals who have discussed or publicly revealed their interest or knowledge in these topics. "I want to believe" and there is a ton of evidence that reassures my belief.
A few more links for your pleasure:
http://listverse.com/2016/08/21/10-government-officials-who-admitted-the-existence-of-aliens/
https://www.telegraph.co.uk/news/newstopics/howaboutthat/ufo/8337299/Alien-life-and-UFOs-10-top-believers.html