Texas Business Organizations Code - BUS ORG § 21.4091. Resignation of Directors

(a) Except as otherwise provided by the certificate of formation or bylaws, a director of a corporation may resign at any time by providing written notice to the corporation.

(b) The director's resignation takes effect on the date the notice is received by the corporation, unless the notice prescribes a later effective date or states that the resignation takes effect on the occurrence of a future event, such as the director's failure to receive a specified vote for reelection as a director.

(c) If the director's resignation is to take effect on a later date or on the occurrence of a future event, the resignation takes effect on the later date or when the event occurs.

(d) The director's resignation is irrevocable when it takes effect.  The director's resignation is revocable before it takes effect unless the notice of resignation expressly states it is irrevocable.