NEW YORK – John S. Koudounis is President and CEO Mizuho Securities USA, the American investment banking subsidiary of the Japanese financial behemoth. There is a Greek component to the rise to such a position by the son and grandson of immigrants, and he is not a lonely Hellene on Wall Street’s heights. In a wide-ranging […] The post Wall Street Heavy Hitter Koudounis Shaped by Sports and Hellenism appeared first on The National Herald.