Meet Robert Mercer, Billionaire Benefactor of Breitbart

Police Probe Extremist Motive in Ohio State Attack

Robert Mercer seemed uncomfortable. It was 2014, and the billionaire had just stepped behind the podium to accept a lifetime achievement award at the annual meeting of the Association for Computational Linguists. Dressed in a suit and tie, he warned his audience that speaking to them for the required hour or so was “more than I…