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Thomas D. Zweifel, Ph.D. is a co-founder and senior consultant of Swiss Consulting Group. Since 1984, he has helped senior executives in numerous Fortune 500 companies, but also governments, the UN and the military, develop leadership and build high-performance teams in the action of meeting strategic and/or breakthrough objectives.

Having lived in Europe, India, Japan, and the United States, Dr. Zweifel serves as a source of power for leaders to cause desired outcomes while building the "3 Cs" (Co-leadership, Communication, Cross-cultural strategies) crucial to 21st-century managers.

Dr. Zweifel is an acclaimed author and internationally recognized expert in the field of global leadership development. Strategies based on his books are used by 30+ Fortune 500 companies, the U.S. State Department, the U.S. Military Academy at West Point, and corporations and governments on four continents. Dr. Zweifel's tools help clients think differently, build trust, restore vision, act strategically, and turn breakdowns into breakthroughs.

Since 2000, Dr. Zweifel has taught leadership to over 700 students at Columbia University, St. Gallen Business School, and business schools in Australia, Israel, and Switzerland to prepare them for executive leadership positions in all sectors. He serves on the faculty of the Master of Arts in Organizational Leadership (MAOL) program that assists senior managers in their leadership research and development.

Dr. Zweifel often appears in the media, including ABC News, Bloomberg TV, and CNN. A speaker for International Speakers Bureau, Vistage International, Brooks International Speakers Bureau, and European Speakers Academy, his interdisciplinary and action-packed global leadership keynotes and workshops are sought-after by government and business leaders alike.

Dr. Zweifel is the author of five books on co-leadership: Communicate or Die: Getting Results Through Speaking and Listening (SelectBooks, 2003); Democratic Deficit? Institutions and Regulation in the European Union, Switzerland, and the United States (Lexington Books, 2002); International Organizations: Democracy, Accountability, Power (Lynne Rienner Publishers, 2005); Culture Clash: Managing the Global High-Performance Team (SelectBooks, 2003); and The Rabbi and the CEO: The Ten Commandments for 21st Century Leaders (SelectBooks, 2008; with Aaron L. Raskin), a 2008 National Jewish Book Award finalist.

Born in Paris, Dr. Zweifel was educated in Switzerland, Germany and the United States, and is fluent in English, German, French, and Italian. He holds a master's degree in international affairs from Columbia University and a Ph.D. in International Political Economy from New York University. In 1996 he realized his dream of breaking three hours in the New York City Marathon, and in 1997 was recognized as the "fastest CEO in the New York City Marathon." He is based in New York and Zurich, where he lives with his wife and two daughters.

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