'Physical Phenomena at High Magnetic Fields III / PPHMF III' is the third conference to be sponsored by the National High Magnetic Field Laboratory (NHMFL), in Tallahassee, Florida. The success of PPHMF I & II, which were held in 1991 and 1995 respectively, encouraged us to once again bring together experts in scientific research areas where high magnetic fields play an important role, to critically assess the current status of research in these areas, and discuss promising new directions in science, as well as applications which are at the forefront of these fields. This conference is perhaps the most important in the area of high magnetic fields.This invaluable volume covers a broad range of materials and phenomena, including semiconductors, magnetic materials, superconductivity, organic solids, the quantum Hall effect, chemical and biological systems and the technological use of high magnetic fields.