- Assistant curator Dumbarton Oaks, Harvard University, Washington, 1984-1991. Associate curator Denver Art Museum, 1991-1995, curator, since 1995. Consultant Time-Life Books, Alexandria, Virginia, 1986-1994, National Geography Society, Washington, since 1986.
- The Middle Horizon in the Valley of Cuzco (British Archaeological Reports (BAR))
- Site survey of the Lucre Basin and excavations at Pikillacta providing evidence for discussion of the impact of the Wari occupation.
1984 - 1991
1991 - 1995