C. G. Caro, a physiologist and medical doctor, is Emeritus Professor of Physiological Mechanics and Senior Research Investigator in the Department of Bioengineering at Imperial College London. T. J. Pedley is the recently retired G. I. Taylor Professor of Fluid Mechanics in the Department of Applied Mathematics and Theoretical Physics (DAMPT) at the University of Cambridge. R. C. Schroter is Emeritus Professor of Biological Mechanics and Senior Research Investigator in the Bioengineering Department at Imperial College London. W. A. Seed worked for many years as a Senior Lecturer in medicine and as a clinical academic physician, with clinical and research interests in cardiopulmonary medicine. He also took a lead role in the development of a medical undergraduate curriculum for the newly-created Imperial College School of Medicine, where he still maintains an honorary teaching role.