Dr. McCaffrey received his B.A. (1985) from Harvard University, magna cum laude with highest honors in geological sciences, and his Ph.D. (1990) in chemical oceanography (in the area of organic geochemistry) from the Massachusetts Institute of Technology/ Woods Hole Oceanographic Institution Joint Program. Mark spent 10 years at Chevron and Arco as a petroleum geochemist, then founded OilTracers LLC, a firm specializing in applications of petroleum geochemistry. He is author of numerous articles on the application of geochemistry to petroleum exploration, reservoir management, oil biodegradation, and paleoenvironmental reconstruction. As an Expert Witness in gas fingerprinting, he has testified (i) in Mississippi State Court, (ii) in Ohio Federal Court, (iii) before the Oklahoma Corporation Commission, and (iv) before the Railroad Commission of Texas. Mark is a PetroSkills Instructor in the area of Oil and Gas Geochemistry, and has taught classes in: Bahrain, Brazil, Colombia, Egypt, England, India, Indonesia, Japan, Jordan, Kuwait, The Netherlands, Mozambique, Saudi Arabia, Tunisia, United Arab Emirates, and the USA.