Ariel Investments, based in Illinois and doing business nationally, and Ariel Capital, based in Florida, both manage money for clients. Investments has used its name since 1983; Capital only since 2014. In a suit under the Lanham Act, 15 U.S.C. 1125(a), the district court found that Capital was infringing Investments’ trademarks. The Seventh Circuit reversed, finding that the court lacked jurisdiction. Capital does not have a client, property, or staff in Illinois, does not advertise in Illinois, and never has had an agent even visit Illinois. The Lanham Act does not authorize nationwide service of process, so personal jurisdiction depends on state law. A defendant’s knowledge and intent concerning a resident of a state do not justify compelling that person to defend himself there. A state may assert specific jurisdiction, based on a particular transaction, only if the defendant has “a substantial connection with the forum State” that is of the defendant’s creation. ”No matter how one might characterize the relation between Ariel Investments and Ariel Capital, it is easy to describe the relation between Illinois and Ariel Capital: none.” If infringement happened, it occurred in Florida, or some state where people who wanted to do business with Investments ended up dealing with Capital because of the similar names.