I'm in an in-house legal office in California and everyone is basically on a first name basis, within the legal office and throughout the rest of the organization. It isn't out of place for the most junior new employee to address attorneys, directors, or anyone else by just their first name. That may not be normal everywhere but I think that's definitely the culture in California. I'm certainly comfortable with it. Honestly, the only people that I don't like calling me by my first name are little kids. I try so hard to teach my daughter to address adults as Mr/Ms/Mrs but I swear every other kid expects to call adults by their first name (and it really galls me when their parents encourage my daughter to do the same).