A Spanish author and journalist, Javier Sierra studied Information Sciences at the UCM, after which he began to work for various media outlets such as Año Cero or Más Allá de la Ciencia,

standing out for his work in disseminating topics related to esotericism, the enigmas of history and other aspects related to the paranormal world.

He has published numerous essays dedicated to the UFO phenomenon, the secret history of Egypt or unexplained events in Spain. Part of the vast documentation collected by the author for these books can also be found in his narrative work.

See here the list of Javier Sierra's books - Lecturalia