George Borjas is the “perfect enemy” of those who believe that mass immigration benefits society, one immigration researcher has written. He “applies honest, fair and constant pressure on our sure beliefs about immigration.”

As a skeptic of high levels of low-skilled immigration who doesn’t think the U.S. is a “melting pot” any longer, Borjas, a Harvard labor economist, at times has found himself in a lonely position for an elite economist in the public sphere.