Hanson v. Denckla, 357 U.S. 235 (U.S. 1958)
Hanson v. Denckla is a cornerstone of personal jurisdiction doctrine, crystallizing the "purposeful availment" requirement that limits a state court's power over out-of-state defendants.
Whether Florida courts could assert personal jurisdiction over a nonresident Delaware trustee in a trust dispute, where the trustee had not purposefully directed activities at Florida and the settlor's unilateral move to Florida created the only meaningful connection to the forum.
Due process permits a state court to exercise personal jurisdiction over a nonresident defendant only where the defendant has minimum contacts with the forum such that the maintenance of the suit does not offend traditional notions of fair play and substantial justice. It is essential that there be some act by which the defendant purposefully avails itself of the privilege of conducting activities within the forum state, thus invoking the benefits and protections of its laws; the unilateral activity of those who claim some relationship with a nonresident cannot satisfy the requirement of contact with the forum state.
No. Florida lacked personal jurisdiction over the Delaware trustee because the trustee did not purposefully avail itself of conducting activities within Florida; the settlor's unilateral move to Florida and the trustee's incidental, derivative contacts were insufficient. Consequently, the Florida decree could not bind the trustee or command full faith and credit in other states.
Hanson firmly installs "purposeful availment" as a constitutional prerequisite for specific personal jurisdiction. It limits a forum's reach by clarifying that a plaintiff's or third party's unilateral actions—such as moving to the forum—cannot manufacture the defendant's minimum contacts. Hanson also shows how International Shoe's flexibility has limits: fairness and forum interest cannot substitute for a defendant's own forum-directed conduct. For law students, the case provides a critical contrast with McGee and a foundation for later cases like World-Wide Volkswagen, Burger King, and Walden, all of which continue to refine specific jurisdiction and purposeful availment.