Carl Johan Calleman holds a Ph.D. in Physical Biology and has served as an expert on cancer for the World Health Organization. He began his studies on the Mayan calendar in 1979 and now lectures throughout the world. He is also author of Solving the Greatest Mystery of Our Time: The Mayan Calendar and The Mayan Calendar and the Transformation of Consciousness.
Carl Johan Calleman holds a Ph.D. in Physical Biology and has served as an expert on cancer for the World Health Organization. He began his studies on the Mayan calendar in 1979 and now lectures throughout the world. He is also author of Solving the Greatest Mystery of Our Time: The Mayan Calendar and The Mayan Calendar and the Transformation of Consciousness. 
