SARIT K. DAS, PhD, is a Professor of the Mechanical Engineering Department at the Indian Institute of Technology Madras. He has authored two books, Engineering Heat and Mass Transfer and Process Heat Transfer, and more than 120 research papers. He is an editor of the International Journal of Heat Exchangers and Heat Transfer Engineering. He is a recipient of the Alexander von Humboldt Research Fellowship of Germany and is a Fellow with the Indian National Academy of Engineering. Dr. Das held visiting positions in Helmut Schmidt University, Germany, Lund University, Sweden, andthe Massachusetts Institute of Technology, USA. STEPHEN U. S. CHOI, PhD, is a ResearchProfessor in the Department of Mechanical and Industrial Engineering at the Universityof Illinois at Chicago. He was previously the project leader and principal investigator for the nanofluids program at Argonne National Laboratory. Currently, he is a Visiting Fellow at the Korea Institute of Energy Research. Dr. Choi has authored or coauthored more than 100 publications and holds three U.S. patents, including the first U.S. patent for nanofluids. WENHUA YU, PhD, is a Mechanical Engineer in the Energy Systems Division at Argonne National Laboratory. He was previously an associate professor in the Department of Mechanical Engineering at Zhejiang University,China. Dr. Yu has authored or coauthored more than fifty publications and holds six patents. T. PRADEEP, PhD, is a Professor of Chemistry at the Indian Institute of Technology Madras.He has held visiting positions at Purdue University, USA; Leiden University, Netherlands; EPFL, Switzerland; Institute of Chemistry, Taiwan; Pohang Institute of Science and Technology, South Korea; and Hyogo University, Japan. He has 160 research papers and seven patents to his credit. He is the author of Nano: The Essentials.