The previous five symposia in the quinquennial GTWS series were held in Ithaca, NY, USA (June, 1983), Minneapolis, MN, USA (September, 1990), Heidelberg, Germany (July, 1995), Miami, FL, USA (June, 2000) and Liège, Belgium (May, 2005). The 6th Symposium on Gas Transfer at Water Surfaces will be held in Kyoto, Japan to provide opportunities for scientists and engineers to present recent advances, discuss current problems, and explore future prospects in research and technology in the area of gas and heat transfer across the air-water interfaces.