Osamu Ishiwata (石渡治, Ishiwata Osamu; born May 16, 1959 in Kanagawa, Japan) is a Japanese manga artist. He won the 1989 Shogakukan Manga Award for shōnen for B.B. The manga artist Yoshitomo Yoshimoto is his younger brother.
Source: “Osamu Ishiwata”, English Wikipedia (CC BY-SA 4.0), excerpt