Former game designer for Nintendo and for a time the right hand man to Shigeru Miyamoto. Former head of now-defunct developer Saru Brunei.
Also notable for his prison diaries, published after a six month stint in a Japanese prison in 1994-1995 for traffic violations. Matsumoto claims his time in prison had a positive and formative effect on his life.
After the dissolution of Saru Brunei, Matsuomoto founded a digital self-publishing service called BCCKS Inc.