465 U.S. 783 (1984)
Calder v. Jones is a landmark Supreme Court case that significantly shaped the doctrine of personal jurisdiction in the United States.
Does a court in California have personal jurisdiction over defendants who published an allegedly defamatory article about a California resident, despite the defendants being based in another state?
The Supreme Court established the 'effects test' for determining personal jurisdiction, which allows a court to exercise jurisdiction over a non-resident defendant if their actions are purposefully directed at the forum state and the effects of those actions are felt there. This principle is rooted in the Due Process Clause of the Fourteenth Amendment, which requires that a defendant have sufficient minimum contacts with the forum state to justify the court's jurisdiction.
The Supreme Court held that California had personal jurisdiction over the defendants. The Court reasoned that the defendants had engaged in conduct that was intentionally directed at California, and the effects of their actions were felt in that state. The Court affirmed the lower court's decision, allowing Jones's defamation claim to proceed in California.
Calder v. Jones is a foundational case in the realm of personal jurisdiction, particularly for cases involving defamation and other torts. It established the 'effects test,' which has been applied in numerous subsequent cases to determine whether a court can assert jurisdiction over non-resident defendants based on the effects of their actions in the forum state. This case is particularly relevant in today's digital age, where actions taken online can have widespread implications across state and national borders.