
Quick answer — Yukio Kaizawa worked on Digimon Tamers (Director), Zatch Bell! (Director), Jigoku Sensei Nube (Director) and 5 more anime.
Yukio Kaizawa worked on Digimon Tamers (Director), Zatch Bell! (Director), Jigoku Sensei Nube (Director), KIRA KIRA☆PRECURE A LA MODE (Chief Director), Digimon Frontier (Director), One Piece: Adventure of Nebulandia (Storyboard), ONE PIECE: Mezase! Kaizoku Yakyuu Ou (Director), Digimon Xros Wars: The Young Hunters Who Leapt Through Time (Director).