Peter Atkins is a fellow of Lincoln College in the University of Oxford and emeritus professor of physical chemistry. He is the author of over seventy books for students and a general audience. His texts are market leaders around the globe. A frequent lecturer in the United States and throughout the world, he has held visiting professorships in France, Israel, Japan, China, Russia, the USA, and New Zealand. He was the founding chairman of the Committee on Chemistry Education of the International Union of Pure and Applied Chemistry and was a member of IUPAC's Physical and Biophysical Chemistry Division. Peter was the 2016 recipient of the American Chemical Society's Grady-Stack Award for the communication of chemistry. Julio de Paula is a Professor of Chemistry, Lewis & Clark College. A native of Brazil, he received a B.A. degree in chemistry from Rutgers, The State University of New Jersey, and a Ph.D. in biophysical chemistry from Yale University. His research activities encompass the areas of molecular spectroscopy, biophysical chemistry, and nanoscience. He has taught courses in general chemistry, physical chemistry, inorganic chemistry, biochemistry, environmental chemistry, instrumental analysis, and writing. Julio was a recipient of the 2020 STAR Award, given by the Research Corporation for Science Advancement. James Keeler is Associate Professor of Chemistry, University of Cambridge, and Walters Fellow in Chemistry at Selwyn College. He received his first degree and doctorate from the University of Oxford, specializing in nuclear magnetic resonance spectroscopy. He is presently Head of Department, and before that was Director of Teaching in the department and also Senior Tutor at Selwyn College.