Jean Rouquerol is the former Director of the CNRS Thermodynamics and Microcalorimetry Center in Marseilles, France and is now Emeritus Director of Research at the MADIREL Laboratory, Aix-Marseille University, France. He is a leading authority on adsorption thermodynamics, thermal analysis methodology and adsorption calorimetry.Françoise Rouquerol leads a Research team at the Centre de Thermodynamique et de Microcalorimetrie and the Centre National de la Recherche Scientifique in Marseille, France. She is also a Senior Professor at the University of Provence, France.Kenneth Sing (1925-2016) was an Emeritus Professor at Brunel University and Visiting Professor at Bristol University, both in the UK. He was an influential figure in colloid and surface science and was co-author of the well-known book Adsorption, Surface Area and Porosity.