Isabel Suárez-Ruiz is a Tenured Scientist at the Instituto Nacional del Carbon (INCAR-CSIC, Spain) working in the field of applied Organic Petrology on coal and coal-by products. She received her PhD in 1988 from the University of Oviedo (Spain) for her Doctoral Thesis on oil shales and source rocks. She has spent extensive periods of time carrying out research in Petrology and Organic Geochemistry in well known laboratories in France (Orléans) and the US (SIU, Carbondale, and CAER, Lexington). Dr. Suárez-Ruiz has published extensively on topics of organic petrology related to fundamental and applied aspects of this science, recently receiving the 2006 Organic Petrology Award from the International Committee for Coal and Organic Petrology (ICCP). John 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 Laboratories 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.