This monograph, which is the outcome of the ASI on High Pressure Chemistry, Biochemistry, and Materials Science, illustrates new developments in the field of high pressure science. In fact, for chemists, biochemists, and materials scientists, pressure as an experimental variable represents a tool which provides unique information about systems of materials. The main contributions to this volume present overview of the different subfields or applications of high pressure studies. In contrast, contributed papers offer more specialized aspects of various high pressure studies. The various contributions to this volume make clear the impressive range of fundamental and applied problems that can be studied by high pressure techniques, and also point towards a major growth of high pressure science and technology in the near future. The book focuses mainly on advances achieved in the six years since the previous ASI devoted to the high pressure field. The organization of this volume is as follows. The main lectures covering the three main areas of high pressure applications to chemistry, biochemistry, and materials science are followed by contributed papers. A summary of a panel discussion on the future of high pressure science and technology concludes this volume.