This excerpt taken from the AMZN 8-K filed Sep 18, 2007.
4.2 Election and Term of Office
The officers of the corporation shall be elected annually by the Board at the Board meeting held after the annual meeting of the stockholders. If the election of officers is not held at such meeting, such election shall be held as soon thereafter as a Board meeting conveniently may be held. Unless an officer dies, resigns or is removed from office, he or she shall hold office until the next annual meeting of the Board or until his or her successor is elected.