James Buchanan Is Dead.
Daniel Kuehn gets it right, I think, on the significance of the career of the late Nobel Prize-winning economist James Buchanan:
He got a lot right, with public choice and constitutional economics. He also got a lot quite wrong, particularly his take on the political economy of the Keynesian revolution. But he certainly was a talented and productive economist well deserving of his Nobel prize.
I would go somewhat further: he got a lot right that desperately needed to be gotten right and that nobody else would have gotten right in his absence. He made a difference in economics at more than the margin, which is something you can say of very few economists.