Chin-Fu Tsang is a Senior Scientist Emeritus in the Energy Geosciences Division and a former Head of the Hydrogeology Department at the Lawrence Berkeley National Laboratory, Berkeley, California. He has a B.Sc. (First Class Honours) in Physics from the University of Manchester, UK, and a Ph.D. from University of California at Berkeley, USA. He is well known internationally for his research in flow and transport in heterogeneous and fractured media, coupled thermo-hydro-mechanical processes in fractured rock, and advanced well tests analysis and borehole testing methods. He is the author or co-author of more than 400 scientific publications, including more than 200 articles in refereed scientific journals and about 120 invited papers and presentations. In addition, he is the co-author or co-editor of nine books and six Journal Special Issues. Dr. Tsang has been very active professionally worldwide. He was a reviewer for the FEBEX project, a joint Spanish-Swiss experiment at the Grimsel Underground Laboratory, funded by CEC, ENRESA and NAGRA. He was also an expert reviewer for STUK, the Finnish government agency overseeing the Finnish nuclear waste research programme. From 2002 to 2009, he was a member of INSITE core group to advice the Swedish government authority, SSM (formally SKI), in their review of the Swedish site characterization programme for evaluating sites for locating a nuclear waste repository in Sweden. From 1992 to 2007, Dr. Tsang was the founding Chairman of the DECOVALEX Project, a ten-nation cooperative research program on coupled thermo-hydro-mechanical-chemical processes in geological media. He was an invited and keynote speaker in many international conferences. From 2008 to 2010, he was a Visiting Professor of Hydrogeology at Imperial College London, UK. Since 2010, he is a Visiting Professor and Visiting Scholar at Uppsala University, Sweden.