Shifeng Dai is a Professor at the China University of Mining and Technology, China. His research fields include coal geology and coal geochemistry. He is the Editor-in-Chief of the International Journal of Coal Geology, the Chief Scientist of the National Key Basic Research Program of China, Changjiang Scholar Professor of Ministry of Education (China) and the National Science Fund for Distinguished Young Scholars of China. Robert B. Finkelman retired in 2005 after 32 years with the U.S. Geological Survey. He is currently a Research Professor in the Geosciences Department at the University of Texas at Dallas, USA, and an Adjunct Professor at the China University of Geosciences (Beijing). He is an internationally recognized scientist widely known for his work on coal chemistry and as a leader of the emerging field of Medical Geology.