Arieh Ben-Naim is Emeritus Professor of physical chemistry who retired in 2003 from the Department of Chemistry, Hebrew University of Jerusalem, Israel. He has made major contributions over 40 years to the theory of the structure of water, aqueous solutions, and hydrophobic-hydrophilic interactions. He is mainly concerned with theoretical and experimental aspects of the general theory of liquids and solutions. In recent years, he has advocated the use of information theory to better understand and advance statistical mechanics and thermodynamics. He has authored more than 230 journal papers and 30 books