Wrongful Conviction for someone who's currently incarcerated?

Okay so I don't really want to get into the entire story because it's really long to type..but does anyone know where I can find a list of attorney's in the California area that would be willing to do a case Pro Bono for someone who's currently incarcerated in Cali due to a wrongful conviction. Yes there's proof, it's just that he doesn't have the financial means to be able to afford an attorney. He's been in for 13 years now.. does anyone know where I can begin? I'd really appreciate an answer, please keep your smart comments to yourselves..