ACTUALLY, your adviser is whoever is the adviser of your major. For instance, I am majoring in Political Science...therefore I go to the Political Science adviser. If you are having trouble finding yours, try looking for the UCB major/minors catalog and it will take you to the info...i.e. courses, general info, the adviser of the major.
Edit: What I meant to say is that you shouldn't necessarily know who your adviser is yet. You don't declare until CalSo and that is when you would normally meet them. A few others and myself have just e-mailed our advisers in advance.