Archaeological excavations at Argentomagus, France, Gallo-Roman city, under the Institute of Archaeology, Sorbonne University (July and August 1982)
Centre d’Archéologie, École Normale Supérieure, French National Centre for Scientific research (C.N.R.S.) since 1983.
Archaeological Department (Colombo) 1983, 1984, 1990-1997.
National Museum (Colombo), from 1983, 1984, 1990-1994.
Central Cultural Fund, Sigiriya Project, 1985, 1990, Jetavanarama Project, 1993-94, Abhayagiriya Project, 1992-1994,
Excavations at Ridiyagama, July-August 1995; July-August 1996; Kelaniya July-August 1997; Pandirendawa from July-August 1998 to January 2004 under the Joint project: French Mission of Archaeological Co-operation & Archaeological Department.
Database of the collection in the Archaeological Museum of Anuradhapura, July-August 2008.
Database of the collection in the Archaeological Museum of Yatala (Tissamaharama), July-August 2009.
Underwater excavations at Godavaya shipwreck, December 2010, December 2011.
British Museum (London), 1985-2001, June 2012.
Ashmolean Museum (Oxford), 1985, 1986, 1989-1994, June 2012.
Fitzwiliam Museum (Cambridge) 1990, 1992, 2011.
Archaeological excavations at Thasos, under the French School of Athens, August 1985.
Hellenic Numismatic Society, Athens, February, 1996, June 1999.
Numismatic Collection of the Alpha Credit Bank, Athens, February, 1996, June 1999.
Munzkabinett, Bodemuseen, Berlin1988.
Private Collections of Dr. W. Pieper Aachen), and Dr. Jens Schumann (Hambourg) May 1993.
Museum Fünf Kontinente, Munich, July 2015.
The American Numismatic Society, (New York) 1988, 1989, 1990, 1992, March-April 1995.