[citation needed] He is a co-author of Training of the American Actor, and he wrote the stage adaptation of the film Stand and Deliver.
By the time he was 25, he was teaching Master Classes around the world, on subjects such as directing, script analysis, performance technique, on-camera acting and audition skills.
[3] His former acting students include Jessica Alba, Rose Byrne, Heather Burns, Eddie Cahill, Justin Chatwin, Abbie Cornish, Peter Facinelli, Matthew Fox, Bryan Greenberg, Simon Helberg, Diane Neal, Jason Ritter, Gina Rodriguez, Shaun Sipos, and Skeet Ulrich.
The film tells the story of two security guards who must protect a rock star's grave against excitable fans who may attempt to commit suicide there.
[9] Bella has worked as an ADR Director with numerous actors, including: Chevy Chase, Judi Dench, Jimmy Fallon, Whoopi Goldberg, Bill Hader, Freddie Highmore, Harvey Keitel, William H. Macy, James McAvoy, Catherine O'Hara, Christina Ricci and Jon Stewart.