Dan Sheehan has been a recognized leader in the movement to end UFO secrecy for over four decades.

His advocacy began in 1977, when he was tasked by the Carter administration to uncover the truth about the 1947 Roswell Incident. Since then, he has worked closely with leaders in the UFO research community, pressing for the formal acknowledgment of the reality of the UFO / UAP phenomenon, and its implications for humanity.

Daniel has a long and distinguished career working to protect civil liberties and human rights, incl. the following famous cases: Karen Silkwood, Three Mile Island, the Pentagon Papers, and Iran-Contra.

And more recently, Dan’s work on the climate crisis and the Lakota People's Law Project brought justice, reparations, and protections to Native Americans. Over the years, Daniel has collaborated closely with other leading Disclosure advocates and researchers, including Dr. John Mack, Paola Harris, Dr. Steven Greer, Leslie Kean, and Luis Elizondo.

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Daniel Sheehan is also a Past Honorary Member of The HDA's Board of Directors.