These two volumes are the proceedings of a major International Symposium on General Relativity held at the University of Maryland 27 to 29 May 1993 to celebrate the sixtieth birthdays of Professor Charles Misner and Professor Dieter Brill. Colleagues, friends, collaborators and former students, including many of the reading figures in relativity, have contributed to the volumes, which cover classical general relativity, quantum gravity and quantum cosmology, canonical formulation and the initial value problem, topology and geometry of spacetime and fields, mathematical and physical cosmology, and black hole physics and astrophysics. As invited articles, the papers in these volumes have an aim which goes beyond that of a standard conference proceedings. Not only do the authors discuss the mort recent research results in their fields, but many also provide historical perspectives on how their subjects developed and offer individual insights in their search for new directions. The result is a collection of novel and refreshing discussions. Together they provide an authoritative and dynamic overview of the directions of current research in general relativity and gravitation theory, and will be essential reading for researchers and students in these and related fields.