David M. Jacobs

American historian

Steven M. Greer

American ufologist

Jim Marrs

American journalist

Budd Hopkins

American painter

Jacques Vallée

Computer scientist

Roger Leir

American surgeon

Tim Maia

Brazilian musician

Maurizio Blondet

Journalist

Philip J. Klass

American journalist

Joseph P. Farrell

Author

Billy Meier

Ufologists

Anton Parks

French author

Roscoe H. Hillenkoetter

Former United States Director of Central Intelligence

Nick Redfern

British author

Bruce Maccabee

American physicist

John Keel

American journalist

George Adamski

American author

JeanClaude Bourret

French journalist

Frank Stranges

Writer

Richard D. Nolane

Author

Franklin Ruehl

American actor

George Van Tassel

American ufologists

Frank Scully

American journalist

Janusz Zagórski

Ufologist

Fabio Zerpa

Uruguayan actor

Jack Krine

Clas Svahn

Journalist

Juri Lina (Jüri Lina)

Swedish author

Corrado Balducci