Krauthammer Canadian? I don't think so. Her grew up in Montreal but is an american by birth. See...
Charles Krauthammer was born in 1950 in New York City. He grew up in Montreal and was educated at McGill University (B A. with First Class Honors in Political Science and Economics, 1970), Oxford University (Commonwealth Scholar in Politics at Balliol College, 1970-71), and Harvard University (MD, Harvard Medical School, 1975). From 1975-78 he practiced medicine as a Resident and then Chief Resident in Psychiatry at the Massachusetts General Hospital His scientific papers, including his co-discovery of a form of manic-depressive illness, are still frequently cited in the psychiatric literature.
He be one smart dude though.