Cal. LAB § 4553

The amount of compensation otherwise recoverable shall be increased one-half, together with costs and expenses not to exceed two hundred fifty dollars ($250), where the employee is injured by reason of the serious and willful misconduct of any of the following: (a) The employer, or his managing representative. (b) If the employer is a partnership, on the part of one of the partners or a managing representative or general superintendent thereof. (c) If the employer is a corporation, on the part of an executive, managing officer, or general superintendent thereof.