Check with local community non-profits such as the local chapter of Rotary Club International or even non-profit business networking clubs. Have you posted an inquiry on linkedin? That could get the ball rolling. Did you go to undergrad in Los Angeles? You might consider reaching out to your undergrad development team or alumni association for tips, or even contact alumni working in those areas directly. Even if you didn't go to school there, you could contact UCLA's Anderson school for leads. I am sure they would be more than happy to help.