Hello, My granite guy did a poor job installing the under mount sink and he used a stainless steel sink he said he can got me a "good deal" on." The sink is cheap and was installed very poorly. I am not on good terms with the granite guy because he decided to increase his price after he installed the granite and sink. Anyhow, I want to know if there are known professionals in Los Angeles County or near by in California who can change an under mount sink without breaking the granite?

Almost any licensed plumber should be able to do this, or a granite top company usually have contracters that work for them that should be able to help you.

I have to ask this, he did a price increase AFTER the install and did a cheap job on the sink. Did you pay him in full already?