Tex. Alcoholic Beverage Code § 5.13

(a) The administrator shall appoint an assistant administrator. The assistant administrator must meet the same qualifications as the administrator. The assistant administrator shall take the constitutional oath of office. In the absence of the administrator, or in case of the administrator's inability to act, the assistant administrator shall perform the duties conferred on the administrator by law or delegated to the administrator by the commission. If there is a vacancy in the office of administrator, the assistant administrator shall perform the duties of the administrator until an administrator has been appointed by the commission. At other times the assistant administrator shall perform those duties and have those functions, powers, and authority as may be delegated to the assistant administrator by the administrator.

(b) The assistant administrator is also known as the deputy executive director.