Ed Tawadros, Ph.D., P. Geol., is an international geological consultant presently based in Calgary, Alberta, Canada. He received a B.A.Sc. degree in geology from Ain Shams University, Cairo, in 1968, followed by a post-graduate Diploma in applied geology from Cairo University, an M.Sc. degree in geology from Universite de Montreal, Canada and a Ph.D. in geology from the University of St. Andrews, Scotland. Since graduation he has worked for a number of consulting and major oil companies, including the General Petroleum Company, Cairo, Egypt, Robertsen Research Company, Canadian Superior Oil, and Mobil Oil Company, Calgary, Canada, and Sirte Oil Company, Libya. He has authored and co-authored a number of papers, including the chapter on the Middle Cambrian to Lower Ordovician in the Geoligical Atlas of the Western Canada Sedimentary Basin. He is a member of the Canadian Society of Petroleum Geologists (CSPG) and the Association of Professional Engineers, Geologists and Geophysicists of Alberta (APEGGA).