Director of Prospection for new open-air Paleolithic sites in southern Germany. 5/96-12/99.
Director of Excavations, Wallertheim, Germany. 7/91-8/91, 6/92-8/92, 6/93-12/94 and 6/94-11/94.
Director of Excavations, Metternich, Germany. 10/93-4/94.
Supervisor of Excavations in Giza's bakery complex, University of Chicago, Giza Plateau Mapping Project, Cairo, Egypt, 5/91-6/91, GPMP Lithic Analyst 4/98, 4/00, 4/01.
Supervisor of Excavations in Flinders Petrie's "Workmen's Barracks" and Lithic Analyst, Yale University, Giza Plateau Mapping Project, Cairo, Egypt, 12/88-2/89.
Director of Excavations, Tönchesberg, Germany, 5/87-6/89.
Field Archaeologist, Museum of Natural History, Paris, 7/86-8/86. Excavation at the Paleolithic site of Roche à Loup, France.
Field Archaeologist, University of Louvain, Belgium, 7/85 and 8/86. Excavation at the Paleolithic site of Grotte Walou, Belgium.
Field Archaeologist, Paleolithic Research Institute of the University of Cologne, 2/84-7/84. Excavations at Plaidter Hummerich, Schweinskopf and Niederbieber.
Staff Archaeologist and Teaching Faculty, Dayton Museum of Natural History, summers 76-84. Excavation at prehistoric archaeological sites, reconstruction of Sun Watch Village, instructor of courses in Ohio Valley prehistory and prehistoric arts and industries.