Mark Cook has been in the oil and gas industry since 1981. He spent eleven years with Shell International working as a reservoir engineer in a variety of locations world-wide and has worked on exploration prospect evaluation, field development planning and production operations. After completing an MBA, he left Shell to co-found TRACS International, providing training and consultancy services to the industry, and worked as petroleum engineer and company Director. When TRACS was acquired by AGR Petroleum Services, he managed the UK and Russian Reservoir Management businesses until 2011. He is active in reserves evaluation for clients including international oil companies, small to medium enterprises. Mark has written and delivers a series of training courses in reservoir engineering, risk analysis and petroleum economics. He is co-author of the popular “Hydrocarbon Exploration and Production? textbook, a SPE Distinguished Lecturer and guest lecturer in petroleum engineering at Aberdeen University, Heriot-Watt University and University College Dublin.