Thomas D. Zweifel has coached senior executives in Fortune 500 companies, SME's, non-governmental organizations, governments, the UN and the military since 1984. Living in Europe, India, Japan and the United States, he has enabled large-scale change processes, built virtual high-performance teams, and realized breakthrough results for clients, often as a virtual leader working through remote empowerment. Thomas serves as a source of power for people to produce the results they want -- from New York to Paris, from Geneva to Moscow, from Tel Aviv to Sydney.

Thomas teaches leadership and cross-cultural management at Columbia University and at St. Gallen Business School (HSG). He publishes frequently on leadership and is the author of Culture Clash: Managing the High-Performance Team and Communicate or Die (both Select Books, 2003); Democratic Deficit? Institutions and Regulation in the European Union, Switzerland, and the United States (Rowman & Littlefield, 2002) and International Organizations: Democracy, Accountability, Power (Lynne Rienner Publishers, 2005). In addition to his writing, Thomas speaks often in corporations, international organizations, and the media, most recently on ABC News and CNN.

Born in Paris, Thomas 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 Relations 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."

Dr. Zweifel's professional affiliations include membership of the International Coach Federation and the Association of Professional Communication Consultants. He also serves on several boards, including the Fondation Arthemis (Geneva), the Lama Gangchen International Foundation (New York) and Paramount Business Jets (New York).