Martin Gray is an anthropologist and photographer specializing in the study of sacred architecture, holy places and pilgrimage traditions around the world. During a twenty-year period, Martin Gray traveled widely in 80 countries to study and photograph more than 1000 holy places of prehistoric, historic and contemporary cultures.

Martin is an expert in the subjects of ancient religion, sacred geography, archaeoastronomy and ecopsychology. In 1997, Martin placed the web site, Places of Peace and Power, at SacredSites.com on the Internet and since that time more than twenty million people have visited the site.

In 2004, National Geographic published The Geography of Religion of which Martin Gray was the principal photographer. In September 2007, Barnes & Noble published Sacred Earth, a large format color photography book of sacred sites around the world.

Martin’s photographs and writings have been featured in documentaries, newspapers, magazines, books and web sites around the globe. He has presented slide shows at museums, conferences and universities, for more than 125,000 people, throughout the world.

Martin's latest collaboration is with LUCITÀ on the Sacred Sites 2008 Mayan Calendar, the world's first dual-system Gregorian-Mayan wall calendar.