Research assistant German Archaeol. Institute, Baghdad, Iraq, 1963-1967. Assistant professor Oriental Institute, University Chicago, 1968-1971.
Professor archaeology Free University Berlin, 1971—2000, vice president, 1977-1981. Excavating and archaeological fieldwork, Iraq, Iran, Pakistan, Jordan, l964-92.
- Archaic Bookkeeping: Early Writing and Techniques of Economic Administration in the Ancient Near East
- Archaic Bookkeeping brings together the most current scholarship on the earliest true writing system in human history.
- Uruk Countryside: Natural Setting of Urban Societies
- xii + 241 pp.