Don Hallett obtained his B.Sc degree in geology from Durham University and his doctorate from University College London. He worked for Esso Exploration Inc. in UK, Morocco and Senegal, and as Area Exploration Manager for Sonatrach in Algeria. He then worked for BNOC on North Sea exploration and was Chief Geologist of its privatised successor Britoil. Dr Hallett then joined Sirte Oil Company and spent ten years in Libya, reaching the position of Exploration Superintendent. Since 1999 he has worked as a consultant, advising companies and conducting workshops in several countries, and producing the first edition of Petroleum Geology of Libya in 2002. In 2005 he became an associate of Nubian Consulting Ltd providing clients with evaluations and advice on Libyan opportunities. He was also joint author of a report on Libyan oil and gas reserves and an atlas of Libyan oil and gas fields.