(a) Any authority, power, or duty vested in the commissioner or department by a provision of this chapter may be exercised, discharged, or performed by a deputy, assistant, examiner, or employee of the department acting in the commissioner’s name and by his delegated authority. In the case of any matters involving the exercise of discretion, the delegation of authority shall be in writing. Any such delegation by the commissioner may be revoked in the same manner in which it was granted.
(b) The commissioner shall be responsible for the official acts of such persons who act in his name and by his authority.