Wis. Stat. § 801.03: Jurisdiction; definitions.

In this chapter, the following words have the designated meanings:

(1) “Defendant” means the person named as defendant in a civil action, and where in this chapter acts of the defendant are referred to, the reference attributes to the defendant any person’s acts for which acts the defendant is legally responsible. In determining for jurisdiction purposes the defendant’s legal responsibility for the acts of another, the substantive liability of the defendant to the plaintiff is irrelevant.

(2) “Person” means any natural person, partnership, association, and body politic and corporate.

(3) “Plaintiff” means the person named as plaintiff in a civil action, and where in this chapter acts of the plaintiff are referred to, the reference attributes to the plaintiff the acts of an agent within the scope of the agent’s authority.