Javier Sierra Albert (Born 11 August 1971 in Teruel, Aragon, Spain) is a journalist, writer and researcher who studied journalism at the Universidad Complutense de Madrid. He is editor consultant of the monthly magazine Más Allá de la Ciencia (Beyond Science) distributed in Spain and Latin America and he participates in several radio and television programs. During the last years, he has concentrated on writing about purported ancient mysteries.

For years, Sierra has been working with people like Graham Hancock and Robert Bauval attempting to demonstrate the existence of a Golden Age of humanity. His hypothesis holds that this Golden Age was extinguished about 10,500 years ago, and it was the origin of all the known civilizations.

His 2006 novel The Secret Supper was in the top ten of the The New York Times Best Seller list and has been published in 42 countries. The Lady in Blue was published in 2007.

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