The international conference on Advances in Ground-Water Hydrology was held November 16–19, 1988, in Tampa, Fla. More than 320 scientists and engineers attended the conference, which was dedicated to the memory of the late C. V. Theis, formerly with the U.S. Geological Survey, an AGU Fellow, holder of the Robert E. Horton Medal, and member of the AGU Hydrology Section since 1934. The 3-day meeting had presentations by more than 100 speakers from Canada, Europe, and the U.S. The conference was organized to review advances in hydrology in the past 10 years. Discussions were held on the need for research and practical applications in groundwater hydrology for the 1990s. The conference was sponsored by the American Institute of Hydrology, in cooperation with the U.S. Geological Survey, Environmental Protection Agency, Universities Council on Water Resources, Wisconsin Geological and Natural History Survey, American Geological Institute, American Society of Agricultural Engineers, American Water Resources Association, Geological Society of America, and International Association of Hydrogeologists.