In this volume the Nippur Expedition publishes the first results of its new program of research at Nippur, the holy city of Mesopotamia. This program, bringing together an interdisciplinary team to work on a historical site in Mesopotamia, focuses on the entire city, not just the sacred aspects. Concentrating on the West Mound, the first season yielded a sequence of temples in Area WA and a Kassite administrative palace above an Old Babylonian house in Area WB.