Quick answer — Masahiko Ootsuka worked on Gurren Lagann (Assistant Director), Gurren Lagann The Movie: The Lights in the Sky are Stars (Director), Whisper of the Heart (Assistant Director) and 11 more anime.
Masahiko Ootsuka worked on Gurren Lagann (Assistant Director), Gurren Lagann The Movie: The Lights in the Sky are Stars (Director), Whisper of the Heart (Assistant Director), FLCL (Animation Director), Gurren Lagann The Movie: Childhood's End (Assistant Director), Promare (Assistant Director), Little Witch Academia: The Enchanted Parade (Script), Panty & Stocking with Garterbelt (Assistant Director) and 6 more.