Texas Government Code - GOV'T § 301.003. Presiding Officers

(a) The secretary of state shall attend and preside at the organization of the house of representatives.

(b) If there is no secretary of state or if the secretary of state is absent or unable to attend, the attorney general shall attend and preside at the organization of the house of representatives.

(c) The lieutenant governor shall attend and preside at the organization of the senate. If the lieutenant governor is absent or unable to attend, the lieutenant governor may designate a member of the senate who is entitled to organize the senate under Section 301.002(a)(1) to preside.

(d) If there is no lieutenant governor, the senator with the greatest number of years of cumulative service as a member of the senate who is entitled to organize the senate under Section 301.002(a)(1) shall preside.