Koudounis is the founder of the Chicago CEO COVID-19 Coalition. He is a member of the Leadership Council at Concordia as well as the Bretton Woods Committee. He is a board member of the National Hellenic Museum, a patron of Prince's Trust International, and an executive advisory board member for the SEAL Future Foundation.[3][4]
Koudounis began his financial career at Merrill Lynch.[2] He then joined ABN AMRO's North American branch, where he became the company's head of fixed income, spending a total of 12 years with the company.[6]
In 2008, Koudounis joined Mizuho Securities USA Inc. as executive managing director and head of fixed income,[7] overseeing trading, sales, and investment banking activities. In his first year, his division earned more than the entire firm had in its history.[2] In 2010, he was appointed president and CEO of the company, at the time becoming the youngest CEO of a Wall Street firm at the age of 44.[2] As well as having direct management responsibilities in the Americas, he served on the management team in Tokyo for the global organization.[citation needed]
In early 2016, Koudounis was the first designated CEO of Calamos Investments, a global investment management firm headquartered in Naperville, Illinois. He was appointed by Founder John Calamos, Sr.[8] as part of Calamos' succession plan.[9] Koudounis leads the firm's business activities, including executing the firm's growth strategy and expanding the firm's global footprint.[10]
Koudounis is the founder of the Chicago CEO COVID-19 Coalition, an organization created in 2020 during the COVID-19 pandemic to provide relief and recovery for the city and bring Chicago's business leaders together in a time of need. The initiative focused on four areas in COVID-19 recovery: food, shelter/homelessness, counseling services, and personal protective equipment. The Coalition distributed over $1.5 million in proceeds from its telethon.[11][12]
Koudounis is a member of the Leadership Council at Concordia[13] and the Bretton Woods Committee.[14] He is a member of the board of trustees of the National Hellenic Museum,[15] a patron of the Prince's Trust International,[16] and an executive advisory board member for the SEAL Future Foundation[17]. He is a founding board member and executive committee member of The Hellenic Initiative.[18] He is also a member of Leadership 100[19] and Chairman of the Metropolis of Chicago Foundation.[20] In 2016, he was inducted as an Archon of the Ecumenical Patriarchate in the Order of St. Andrew.[21]
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