This book brings together twenty of the most important papers by the late Professor Peter Rolfe Vaughan on geotechnical engineering. Selected by Peter's closest colleagues at Imperial College and the Geotechnical Consulting Group, these papers are reproduced along with the obituary published in Géotechnique, a full listing of his bibliography, some photographs and personal reflections by David Hight, David Potts, Nebojša Kovačević and Finlay Jardine on working with Peter. The papers were chosen to illustrate Peter's academic work and his considerable impact on civil engineering practice. Many of the papers were awarded distinguished prizes and some are drawn from sources that are now hard to access. The volume will be valued by researchers, practitioners and all those who studied or worked with Peter.T