Stephen Herek Director Sophie Nélisse Gilly Hopkins Actor Kathy Bates Maime Trotter Actor Glenn Close Nonnie Actor Octavia Spencer Ms. Harris Actor Julia Stiles Courtney Actor Bill Cobbs Mr. Randolph Actor Billy Magnussen Ellis Actor Zachary Hernandez W.E. Actor Clare Foley Agnes Actor Sammy Pignalosa Rajeem Actor Toby Turner Ticket Agent Actor Richard Topol Principal Evans Actor Cara Cooper Woman With Book Actor Salvatore Rossi Stevie Actor Cameron Clifford Ed Actor Julee Cerda Mrs. Hong Actor Johanna Day Principal Maynard Actor Katherine Paterson Clerk Actor Victor Garcia Angry Gardener Actor Frank Oz Voice of Cookie Monster Voice David Paterson Screenwriter, Producer John Paterson Producer William Teitler Producer Brian Kennedy Producer William Kay Executive Producer Robert Berney Executive Producer Eve Schoukroun Executive Producer Chip Flaherty Executive Producer David M. Dunlap Cinematographer David Leonard Film Editing Mark Isham Original Music Ola Maslik Production Design Christopher Minard Art Director Lauren DeTitta Set Decoration Meghan Kasperlik Costume Design Avy Kaufman Casting