Henry Kissinger, speaking with The Economist:
It is undoubtedly the case that modern technology poses challenges to world order and world order stability that are absolutely unprecedented. Climate change is one of them. I personally believe that artificial intelligence is a crucial one, lest we wind up… creating instruments in relation to which we are like the Incas to the Spanish, [such that] our own creations have a better capacity to calculate than we do. It’s a problem we need to understand on a global basis.
For reference, here is Wikipedia on the Spanish conquest of the Inca empire.
Henry Kissinger also addressed artificial intelligence in a recent interview with The Atlantic, though in this case he probably was not referring to smarter-than-human AI:
A military conflict between [China and the USA], given the technologies they possess, would be calamitous. Such a conflict would force the world to divide itself. And it would end in destruction, but not necessarily in victory, which would likely prove too difficult to define. Even if we could define victory, what in the wake of utter destruction could the victor demand of the loser? I am speaking of not merely the force of our weapons, but the unknowability of the consequences of some of them, such as cyberweapons. Traditional arms-control negotiations necessitated that each side tell the other what its capabilities were as a prelude to limiting those capacities. Yet with cyber, each country will be extremely reluctant to let others know its capabilities. Thus, there is no self-evident negotiated way to contain cyberwarfare. And artificial intelligence compounds this problem. Machines that can learn from their own experience and communicate with one another on their own raise both a practical and a moral imperative to find a way to keep mankind from destroying itself. The United States and China must strive to come to an understanding about the nature of their co-evolution.