John Koudounis
Calamos Investments

John Koudounis assumed the position of Calamos Investments CEO in 2016 and has more than 35 years of experience on Wall Street. In 2008, he was recognized as the youngest CEO on Wall Street, serving as President and Chief Executive Officer of Mizuho Securities USA. During his tenure, he built the firm into a top 10 Global Investment Bank. Since joining Calamos, Mr. Koudounis has more than doubled the assets under management. He expanded Calamos’ executive talent with key hires in personnel and investment teams with innovative strategies to enable firm growth. Mr. Koudounis is often sought-after for speaking engagements at conferences worldwide and frequently appears on financial news programs such as CNN, Fox, Fox Business, CNBC, Bloomberg TV, TD Ameritrade, Yahoo Finance, and others. He graduated from Brown University, where he played football and earned degrees in International Diplomacy, Foreign Affairs and Economics. He is a devoted husband and father to his twin daughters.