Cal. Corporations Code § 13405 : Corporations — California Corporations Code — Corporations For Specific Purposes — Rendering professional services

The corporation may employ persons not so licensed, but such persons shall not render any professional services rendered or to be rendered by that corporation in this state. A professional corporation may render professional services outside of this state, but only through employees who are licensed to render the same professional services in the jurisdiction or jurisdictions in which the person practices.

Nothing in this section is intended to prohibit the rendition of occasional professional services in another jurisdiction as an incident to the licensee's primary practice, so long as it is permitted by the governing agency that regulates the particular profession in the jurisdiction. Nothing in this section is intended to prohibit the rendition of occasional professional services in this state as an incident to a professional employee's primary practice for a foreign professional corporation qualified to render professional services in this state, so long as it is permitted by the governing agency that regulates the particular profession in this state.