Wis. Stat. § 180.1913: Alternative incorporation by one or 2 persons.

(1) A service corporation which has only one shareholder need have only one director, who shall be the shareholder. The shareholder shall also serve as the president and treasurer of the service corporation. The other officers of a service corporation described in this subsection need not be licensed, certified or registered in the same field of endeavor as the president.

(2) A service corporation which has only 2 shareholders need have only 2 directors, who shall be the shareholders. The 2 shareholders shall fill all of the general offices of the service corporation between them.