Adrian Gilbert is the author and independent publishing consultant. In 1991 he set up Solos Press, a small publishers specialising in Christian Mysticism, Gnosticism and the Hermetic tradition of Egypt. He has been researching Ancient Egypt for over twenty years and regards the discoveries contained in The Orion Mystery as crucial to our understanding of the pyramid age.

Robert Bauval was born in Egypt in 1948. A construction engineer, his interest in Egyptology is long standing, having lived in Egypt and elsewhere in the Middle East for much of his life. In the 1980s he developed a line of study linking the pyramids and the so-called Pyramid Texts with astronomy. He has published several papers on this subject and his findings have been presented at the British Museum. His is the co-author of three international bestsellers: The Orion Mystery and Keeper of Genesis and more recently The Secret Chamber.