As Principal at Trilogy Advisors LLC in Washington, D.C., John Sitilides specializes in government relations, geopolitical risk, and international affairs. He is also a National Security Senior Fellow at the Foreign Policy Research Institute. Sitilides frequently speaks at corporate, investment, and industry conferences, as well as to government, military, and intelligence community audiences, on managing geopolitical risks that affect markets in Asia, Europe, the Middle East, and worldwide.

Under a U.S. government contract from 2006-2023, Sitilides was the Southern Europe Regional Coordinator at the Foreign Service Institute, the State Department's professional development and diplomacy academy for American foreign policy professionals. He was Board Chairman of the Woodrow Wilson Center Southeast Europe Project from 2005-2011, following seven years as Executive Director of the Western Policy Center, an international relations institute specializing in southeastern European affairs. He launched his career in the U.S. Senate, has testified before Congress, and is a regular national security commentator on U.S. and international media. He serves on the Executive Committee and Board of Trustees of Leadership 100, a Greek Orthodox Christian foundation, and is an Archon of the Ecumenical Patriarchate. He was a board director for media technology and biopharmaceutical companies, and of the International Orthodox Christian Charities. Sitilides holds a master’s degree in International and Public Affairs from Columbia University. His wife is an attorney and businesswoman, and they have four sons.