Alan Butler has had a lifelong fascination for ancient history and especially for the Megalithic period in Western Europe. He has studied carefully over the last couple of decades in order to acquire the best possible understanding of ancient astronomy and is also something of an expert on the evolution of calendars and measuring systems. On his own, and also together with Christopher Knight, he has written a number of books on these subjects. Alan is also a humorist and a radio and stage playwright. He lives in East Yorkshire but travels extensively these days, both throughout Britain and across the world, lecturing and taking part in documentaries.