Cal. Food & Agric. Code § 65553

A commissioner shall be an individual producer, or a partner or employee of a producer, who is actively engaged in growing fresh grapes within this state for a period of at least five years and is producing grapes subject to this chapter at the time of the election. No more than two members shall be persons employed by, or connected in a proprietary capacity with, the same corporation, firm, partnership, association, or business entity, provided that not more than one member in any district shall be so employed or connected. A commissioner shall maintain these qualifications during their term of office in order to remain on the commission.