John Koudounis

Mr. John S.
Koudounis is a Vice President at Calamos Long/Short Equity & Dynamic Income Trust, a President, Chief Executive Officer & Director at Calamos Asset Management, Inc., a President & Chief Executive Officer at Calamos Advisors LLC, at Calamos Financial Services LLC, at Calamos Investments LLC, and at Calamos Wealth Management LLC.
He is on the Board of Directors at Calamos Asset Management, Inc., National Hellenic Museum, The Hellenic Initiative and World Business Chicago.
Mr. Koudounis has over 37 years of experience in financial services, including executive leadership in the global securities business and a deep background in global capital markets.
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.
During his tenure at Mizuho Securities, Mr. Koudounis built the firm into a full-service investment bank, expanding its debt and equity capital markets teams.
Before joining MSUSA in 2008, he was Managing Director and Head of Fixed Income for ABN AMRO Americas.
He graduated from Brown University with a degree in International Diplomacy & Foreign Affairs and Economics.