Artist.

Japanese name: 神山 律 (reading is given as Kouyama Ritsu)
Circle name: スタジオ・アリエッタ (Studio Arietta) (the other members: "Amakawa Takahiro":[http://www.pixiv.net/member.php?id=56588], Eringi, [[Anonimasu]] and [[Hirotomo]])
Site names: 神山の住所 or 神山の住家
kouyama ritsu