Yizhak Marcus, PhD, is a Professor Emeritus at the Hebrew University in Israel. His main interest is the chemistry of liquids and solutions: aqueous, non-aqueous, and mixed solvents, supercritical fluids, solutions of electrolytes and non-electrolytes. He has published in this and neighboring fields 10 books and over 300 papers in refereed journals as well as some 30 chapters in multi-author books.