Dr Caesar Voute — Professor Emeritus of the International Institute for Aerospace Surveys and Earth Sciences in The Netherlands — is a specialist in the fields of hydrogeology and engineering geology. Dr Voute joined Dr Bernard Groslier — the director of the Conservation and Restoration works at Angkor Wat — on a UNESCO-sponsored expert mission conducted in 1968 to study the conservation and restoration problems at Borobudur. Born in the city of Magelang nearby, the Dutch geologist had literally grown up in Borobudur’s general vicinity. From 1971 until 1975, Dr Voute served as the resident UNESCO/UNDP coordinator for the Borobudur Reconstruction Project.