Person

Greg Sestero

9 credits in the catalogue: acting, writing, production.

On the wikisThe Room Wiki

Acting

Gattaca1997Gattacan Citizen (uncredited)
Patch Adams1998Jaime
EDtv1999Roach
Retro Puppetmaster1999Andre Toulon
The Room2003Mark
Accepted2006Frat guy (uncredited)
The Disaster Artist2017Casting Agent (uncredited)

Writing

The Disaster Artist2017Book

Production

The Room2003Line Producer