He was an insei at the Nihon Ki-in, Tokyo from October 2011 to May 2012 and again from April 2014. He finished the Winter 2015 pro exam with over 50% win rate (8-7 and 9th in the 16 player round robin), which qualified him for Foreign National Pro slot. Antti is the first westerner to be promoted by the Nihon Kiin since Hans Pietsch and Taranu Catalin 18 years ago. Formal announcement was published on Dec. 7, 2015 on Mainichi Newspaper to be 1p as of April 1, 2016.
Known on OGS as Ten and KGS as Tien. He is one of the creators and main teachers of the Nordic Go Dojo.
Honsen (Pro qualification tournament) results: http://www.nihonkiin.or.jp/player/saiyou/result/2016/honsen.html