Cal. Unemployment Insurance Code § 1735

Any officer, major stockholder, or other person, having charge of the affairs of a corporate, association, registered limited liability partnership or foreign limited liability partnership, or limited liability company employing unit, who willfully fails to pay contributions required by this division or withholdings required by Division 6 (commencing with Section 13000) on the date on which they become delinquent, shall be personally liable for the amount of the contributions, withholdings, penalties, and interest due and unpaid by such employing unit. The director may assess such officer, stockholder, or other person for the amount of such contributions, withholdings, penalties, and interest. The provisions of Article 8 (commencing with Section 1126) and Article 9 (commencing with Section 1176) of Chapter 4 of Part 1 apply to assessments made pursuant to this section. Sections 1221, 1222, 1223, and 1224 shall apply to assessments made pursuant to this section. With respect to such officer, stockholder, or other person, the director shall have all the collection remedies set forth in this chapter.