Koitsu.com is compiled and managed by Ross Walker as a public educational resource for all things related to the master Shin Hanga woodblock print artist Tsuchiya Koitsu. The resources available on this site include research articles as well as the web's only comprehensive database-enabled catalogue of Koitsu prints, the The Catalogue Raisonne of Tsuchiya Koitsu. Note: The artist Rakusan Tsuchiya is a completely different artist.
Ross is also the proprietor of Ohmi Gallery, the private gallery of Ross's Ukiyo-e and Shin Hanga woodblock print collection. Artists include Tsuchiya Koitsu, Bakufu Ohno, Mamoru Hiyoshi, Shiro Kasamatsu, Tomikichiro Tokuriki, Takeji Asano, Chikanobu Yoshu, Utagawa Kunisada, Kunisada II, Kunisada III (Housai), Kuniaki, Gekko, Nobukazu, Eiichi Kotozuka, Toko (Hasui?), Sanzo Wada, Shuzo Ikeda, Tamami Shima, Amano, and Kaoru Kawano.