John Koudounis joined Calamos Investments as Chief Executive Officer in 2016. His principal duties include overseeing the firm’s day-to-day operations, fiscal function and overall performance. His responsibilities include managing operations, leading business and corporate development, and directing strategic growth initiatives.
Mr. Koudounis has 31 years of financial services experience including executive leadership in the global securities business and a deep background in global capital markets. Most recently, he served as President and Chief Executive Officer of Mizuho Securities USA, Inc. (MSUSA), a subsidiary of Mizuho Financial Group, one of the world’s largest full-service financial institutions.
Mr. Koudounis is a public speaker and appears frequently on financial news programs including CNN, Fox Business, CNBC, Bloomberg TV and others. He is a member of the Leadership Council at Concordia and the Bretton Woods Committee, as well as a board member of The Hellenic Initiative and the National Hellenic Museum. He received his B.A. in International Diplomacy, Foreign Affairs and Economics from Brown University.