California Code, Health and Safety Code - HSC § 1797.202

(a) Every local EMS agency shall have a full- or part-time licensed physician and surgeon as medical director, who has substantial experience in the practice of emergency medicine, as designated by the county or by the joint powers agreement, to provide medical control and to assure medical accountability throughout the planning, implementation and evaluation of the EMS system.The authority director may waive the requirement that the medical director have substantial experience in the practice of emergency medicine if the requirement places an undue hardship on the county or counties.

(b) The medical director of the local EMS agency may appoint one or more physicians and surgeons as assistant medical directors to assist the medical director with the discharge of the duties of medical director or to assume those duties during any time that the medical director is unable to carry out those duties as the medical director deems necessary.

(c) The medical director may assign to administrative staff of the local EMS agency for completion under the supervision of the medical director, any administrative functions of his or her duties which do not require his or her professional judgment as medical director.