Face-To-Face With Cambridge Analytica’s Elusive Alexander Nix

Photo: Patricia de Melo Moreira/AFP/Getty Images

By Parmy Olson

“The big mystery of Big Data,” said Alexander Nix, “is causation versus correlation.”

He paused and looked out of the second-story window of his office.

On the street below, red, double-decker buses snaked around a corner through London traffic. He lightly tapped a Swiss Army knife on his desk…

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