William N. Krebs graduated with a B.S. in Geology from the University of California at Los Angeles and received his Ph.D. in Geology from the University of California at Davis. He is currently a geoscience consultant who specializes in the use of biostratigraphic data for well and regional correlations, paleoenvironmental analysis, depositional and basin modeling, and for sequence stratigraphy and chronostratigraphy. He has over 30 years of experience in the petroleum industry as a technical worker, manager, mentor, and instructor for Amoco Production Co., the Energy and Geoscience Institute (EGI) of the University of Utah, and for Petronas Carigali (Kuala Lumpur, Malaysia). He has field work experience in North and South America, Africa, and Asia, and has led field trips and taught seminars in the US and Egypt. He has also written and published numerous technical papers on the application of microfossils to stratigraphic research.