Yanni Sianis is an Executive Officer and is the Chief of Staff of Calamos Investments. He joined the firm in 2010 as a Wealth Adviser with Calamos Wealth Management. Yanni currently serves as a Board Director of Calamos Antetokounmpo Asset Management LLC. Prior to his current appointment, Yanni served as Vice President of Global Business Development and was responsible for managing both domestic and international relationships for the private and institutional channels.

Prior to joining Calamos, Yanni was a senior derivatives broker and trader at LaSalle Global. He previously served as Vice President of Business Development and Director of the GCC (Cooperation Council for the Arab States of the Gulf) and the Middle East at America 2030 Equity, a private equity firm outside of Chicago.

Yanni earned a B.A. from Boston University, an M.A. in Industrial Psychology from National Louis University and an AMP from the University of Chicago, Booth School of Business.

Yanni is active in the Greek American community and is currently serving his third term on the Metropolis Council of the Greek Orthodox Metropolis of Chicago, is Chairman of Project Hope – a Humanitarian Ministry, a Board Member of the American Hellenic Institute, an Executive Committee Member of the Board of the National Hellenic Museum, a member of Leadership 100 and the National Hellenic Society, and an Archon of the Ecumenical Patriarchate in the Order of St. Andrew, the highest honor bestowed on a layman by the Orthodox Church.