Chin-Fu Tsang is a Senior Scientist Emeritus in the Earth Sciences 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 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 about 160 articles in refereed scientific journals and about 110 invited papers and presentations.