John C. CrellingJohn C. Crelling received his B.A. in Geology (University of Delaware) in 1964. At The Pennsylvania State University he received his M. S. degree in Geology in 1967 and his PhD in1973. He started his professional career in 1972 at the Homer Research aboratories of the Bethlehem Steel Corporation. In 1977 he became a Professor of Geology at Southern Illinois University and leader of the Coal Characterization Laboratory. At SIU he established a research program with the overall objective of improving the petrographic characterization of coal to better predict its behaviour and later he established a Maceral Separation Laboratory for the separation and characterization of pure coal macerals. He recently created an internet-based petrographic atlas of coals, cokes, chars, carbons, and graphites. Read More Read Less