Quick answer — Katsumi Ishizuka worked on One Piece: Episode of Merry - The Tale of One More Friend (Animation Director), One Piece - Episode of Sabo: Bond of Three Brothers - A Miraculous Reunion and an Inherited Will (Key Animation), One Piece The Movie: The Dead End Adventure (Key Animation) and 4 more anime.
Katsumi Ishizuka worked on One Piece: Episode of Merry - The Tale of One More Friend (Animation Director), One Piece - Episode of Sabo: Bond of Three Brothers - A Miraculous Reunion and an Inherited Will (Key Animation), One Piece The Movie: The Dead End Adventure (Key Animation), One Piece: Romance Dawn Story (Assistant Animation Director), One Piece: Clockwork Island Adventure (Key Animation), One Piece: Mega Mecha Soldier of Karakuri Castle (Key Animation), One Piece: Chopper’s Kingdom on the Island of Strange Animals (Key Animation).