Dr. William L. Leffler, a retired executive from Royal Dutch/Shell, spent 36 years with that company. During his career he spent time in refining and marketing, petrochemicals, and corporate planning in the United States, and in exploration and production in London. He earned his MBA and PHD at New York University, and a BS at MIT. He has authored multiple PennWell titles including the bestselling Petroleum Refining in Nontechnical Language, 4th Edition (2008), Petrochemicals in Nontechnical Language, 4th Edition (2010), and Deepwater Petroleum Exploration & Production: A Nontechnical Guide, 2nd Edition (2011).
Martin S. Raymond, a veteran of more than 40 years in exploration and production, was senior vice-president - E&P for J.M. Huber Corporation. During his career he also held engineering, administrative, and management positions with Shell Oil and Forest Oil. He earned a BA degree from Princeton in geology and a masters degree from the University of California at Berkeley. Currently, Raymond consults in the area of operating process management for E & P companies.