Chief Executive Officer, Calamos Investments
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 33 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, often sought after for his thought leadership, serves as a speaker at conferences worldwide and appears frequently on financial news programs including CNN, Fox Business, CNBC, Bloomberg TV, TD Ameritrade Network, Yahoo Finance Live, and others. He is a member of the Leadership Council at Concordia and the Bretton Woods Committee. He graduated from Brown University with a degree in International Diplomacy & Foreign Affairs and Economics. Mr. Koudounis is a member of the Leadership Council at Concordia and the prestigious Bretton Woods Committee. He is a member of the board of trustees of the National Hellenic Museum, a patron of the Prince’s Trust International, and an executive advisory board member for the SEAL Future Foundation. He is a founding board member and executive committee member of The Hellenic Initiative, a non-profit, non-governmental organization with the aim of supporting Greece and Cyprus in the aftermath of the financial crisis by helping to foster entrepreneurship in both countries. He is also a member of Leadership 100 and the Metropolis of Chicago Foundation. In October 2016 he was inducted as an Archon of the Ecumenical Patriarchate in the Order of St. Andrew, the highest honor bestowed on a layman by the Orthodox Church. He also serves as Chairman of the Investment Committee of the Ecumenical Patriarch Bartholomew Foundation.