His research interests include structure, petrology and geochemistry of ophiolites in Albania, California, Cyprus, Egypt, Greece, Oman, Turkey, Norway, California, China, Tibet, and peri-Caribbean; mid- ocean ridge tectonics and ocean crust generation in the MARK area (Mid-Atlantic Ridge) and the Costa Rica Rift (Eastern Equatorial Pacific Ocean); microbial alteration of oceanic lavas; active margin and strike-slip tectonics of the Caribbean region; tectonics of the Alpine-Himalayan, Cordilleran, Northern Appalachian, and Caledonian orogenic belts; Cenozoic tectonics and volcanism of Southern Tibet; post-collisional magmatism in the Alpine-Himalayan orogenic belt; geomorphology and neotectonics of continental collision zones (Caucasus Mountains, Republic of Georgia and Azerbaijan); Mesozoic tectonics and magmatism in East-SE China and Continental Dynamics of East Asia; extensional tectonics, core complex formation and magmatism in the Aegean Province (Greece and Turkey); Paleozoic tectonics of the Tarim Basin and the Tianshan orogenic belt, China; Precambrian tectonics of the Arabian-Nubian Shield (Egypt, Sudan and Saudi Arabia), Isua greenstone belt (Greenland), and Barberton greenstone belt (South Africa); tectonic evolution of the Chilean Patagonia and the Southern Andes; Archean Earth and evolution of life; rivers, dams and environmental issues; geohazards and their impact on nations and civilizations.