VIENNA — Alexander Schwartz wasn’t expecting two veteran innovation investors to show up at his Klosterneuburg office this spring, asking how to plot their escape from the U.S. After two decades in Cambridge, Massachusetts, the pair had decided it was time to come home. “They told me, ‘It doesn’t feel right over there anymore. Some of the opportunities are just gone,’” said Schwartz, who works at Xista, an innovation hub just outside Vienna. Advertisement “But they see a window of opportunity