As a young officer candidate in the Austrian army in 1938, Francis Heller put himself at risk by refusing to swear an oath of allegiance to Adolf Hitler. Had he stayed in Vienna, he would have been arrested by the Gestapo as a supporter of Austrian independence and an enemy of the Nazis. But he managed to escape into Czechoslovakia under cover of darkness. He subsequently made his way to America, where he finally pursued the academic career that military...