Jan van der Steen
Jan van der Steen (born 21 August 1957) is a Dutch 3-dan amateur Go player.
van der Steen became a 1-dan in 1984, a 2-dan in 1985, and a 3-dan circa 1986.
van der Steen appears regularly on IGS as 'jansteen' and manages a website containing an enormous number of professional Go games, as well as an online joseki dictionary, a fuseki dictionary and much more. Well worth a visit!
He created GoBase, an excellent site on Go. The site is entitled Go, An Addictive Game.