sentences:  Once there, Kitzinger was assigned by Wilhelm Koehler to a systematic study of the Byzantine monuments of the Balkans (leading to an important article on the monuments of Stobi (1946)).Several years later, after a wartime stint with the OSS in Washington, London, and eventually Paris, Kitzinger began work on a complete survey of the mosaics of Norman Sicily.This project would occupy him for the rest of his life, resulting first in "The Mosaics of the Capella Palatina in Palermo