Family man, filmmaker and gambler Matt Gallagher hit tough times some years back. No work and a wife and child to support, he took his poker hobby and turned it into his profession. The hours were bad, the competition was brutal and the whole racket is illegal, but somewhere in that nasty brew was the idea for a film. 'Grinders' was born out of circumstance, need and luck.

This documentary follows the men (and some women) who make poker their lives. Old pros, up-and-comers, game managers and success stories make up the collage of characters profiled in the film. Gallagher travels from his native Toronto all the way to Las Vegas to tell his tale, and the results are fascinating.

Moviefone sat down with Gallagher to discuss this underground world of illegal poker, and how it can turn from a hobby into a job into an obsession.