Javier Sierra

In 1989, being 12 years old, he hosted the radio programme Radio Heraldo.^[2] Six years later he founded the journal Año Cero.^[3]

He is editor consultant of the monthly magazine Más Allá de la Ciencia (Beyond Science)^[4] 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^[quantify], Sierra has been working with people like Graham Hancock and Robert Bauval attempting to demonstrate the existence of a Golden Age of humanity.^[5] His hypothesis holds that this Golden Age was extinguished about 10,500 years ago, and it was the origin of all the known civilisations.^[6]

In 1995 he published Roswell: Secreto de Estado, about the Roswell incident, where he analysed the case.^[7]

He became the first Spaniard to be in the Top Ten of best sellers in United States.^[8] His 2006 novel The Secret Supper was in the top ten of The New York Times Best Seller list and has been published in 42 countries.^[9] The Lady in Blue was published in 2007.

On 20 December 2017 it was released the documentary fiction Otros mundos by #0, which is about the great mysteries in the world.^[10] On 22 December 2019 it was released the second season.^[11]

• El fuego invisible (2017)
• La pirámide inmortal (2014)
• El maestro del Prado (Planeta, 2013)
• El ángel perdido (Planeta, 2011)
• La cena secreta (Plaza & Janés 2004)
• El secreto egipcio de Napoleón (La Esfera de los Libros, 2002)
• Las puertas templarias (Martínez Roca, 2000)
• La dama azul (Martínez Roca, 1998)

• La ruta prohibida y otros enigmas de la historia (Planeta, 2007)
• En busca de la Edad de Oro (Plaza & Janés, 2000)
• La España extraña (EDAF, 1997), in collaboration with Jesús Callejo
• Roswell: secreto de Estado (EDAF, 1995)

• He participated in the collective work Relatos Ferroviarios Sobre Raíles (Imagine Ediciones, 2003)
• He directed and prologued the historical intrigue novels collection La Cámara Secreta (col. Nº 80) for Círculo de Lectores (2003–2004).

• 2004: Premio de Novela Ciudad de Torrevieja, finalist, La Cena Secreta.^[12]
• 2017: Cruz de San Jorge from the Teruel deputation.^[13]
• 2017: Premio Planeta de Novela, winner, El fuego invisible^[14]
• 2018: Hijo Predilecto de Teruel.^[15]

• Collaborator in La Rosa de los Vientos, Onda Cero Radio (2004–2006).
• Collaborator in Herrera en la onda (before Herrera y punto), Onda Cero Radio (2002–2003).
• Collaborator in Milenio 3, Cadena SER Radio (2002).
• Consultant in El Callejero, Onda Cero Radio (1998).
• Consultant in Viva la Radio, Radio Voz (1996–1998).
• Consultant in La Ventana Indiscreta, Cadena SER Radio (1989).
• Consultant in Espacio en Blanco, Radio Nacional de España (1987–1988).
• Director and presenter of La Otra Ciencia and Mare Nostrum, Radio Nueva (1986–1988).

• Director and TV presenter of El Otro Lado de la Realidad, Telemadrid (2004–2005).
• Collaborator in Cada Día, Antena 3 TV (2005).
• Collaborator in Crónicas marcianas, Telecinco (1999–2004).
• Editor of Otra Dimensión, Telecinco (1993).

• Editor consultant of the magazine Más Allá de la Ciencia (M.C. Ediciones, 2005).
• Editor Director of Revista de Arqueología (MC Ediciones, 2002), the most important publication of its genre in Spain.
• Director of the magazine Más Allá de la Ciencia (M.C. Ediciones, 1998). He carried out the change of format, readjusts of contents and image, since January 1999.
• Coordinator of the special numbers of magazine Más Allá de la Ciencia, Grandes enigmas de Europa y América, Pirámides del mundo, Grandes misterios de la Tierra, Misterios de Egipto, among others.
• Assistant director of the magazine Más Allá de la Ciencia (J.C. Ediciones, 1995–1998).
• International coordinator of magazine Año Cero (América Ibérica, 1994).
• Editor of magazine Más Allá de la Ciencia (Heptada, 1993).
• Co-founder of the magazine Año Cero (Hobby Press 1990).

• Consultant of the collection Huellas Perdidas de Grijalbo Mondadori (2000–2001).
• Editor consultant of the collection Ediciones Martínez Roca (2001).