Koichi Takeuchi was born in 1941 (Showa 16) in Kyoto prefecture.  In 1966, he entered the school of Shincho-sha under Kayou Yamaguchi.  He received first prize for his work in the 1977 Yamatane Museum of Art Awards Exhibition.  In 1984, he participated in the formation of Yoko no Kai — a joint effort founded with the goal of exhibiting freely from the constraints of organizations — where he would go on to present his works for a decade.  He received special recognition for his work in the 1979 and 1988 editions of Nitten.  In 1996, he was awarded first prize in the 9th edition of the MOA Museum of Art’s Mokichi Okada Awards Exhibition.  In 2005, he participated in the group exhibition, Seisei-kai alongside Yoshihiro Shimoda, Toshio Tabuchi, and Susumu Maki.  In 2016, he completed a series of paintings on 72 fusuma panels at Hoshunin, situated within the Daitokuji temple complex in Kyoto.  He currently is a well-renowned figure of contemporary Nihonga, known for his depictions of animals, and birds and flowers.