Oskar Morgenstern: German
Ferdinand Porsche: German
Valier: never heard of this guy until I looked him up just now; a true Austrian - albeit born in Italy and worked in Germany. Damned shame he died so young.
Karl Popper: Jew
Ludwig Boltzmann: the second real Austrian on this list.
Christian Doppler: another real Austrian...
Ernst Mach: Volksdeutsche from what is now Czech Republic.
Wolfgang Pauli: Czech-Jew, and related to Mach.
Kurt Gödel: German AMERICAN, F YEAH!! :)
Gregor Mendel: Volksdeutsche, from Silesia (now part of Czech Republic)
So I see only 3 Austrian on this list!
P.S. the Brits/Finns/Ukrainians/Russians always make a good joke at Germans' expense, but Austria always gets a free pass... I'm trying to right that wrong! :)