Harriet C. Babbitt is the Permanent Representative of the United States to the Organization of American States. From 1988 until 1993, Babbitt, 47, served as a director of the National Democratic Institute for International Affairs (NDI), an independent organization affiliated with the Democratic Party that promotes the establishment and growth of democratic institutions internationally. A fluent Spanish speaker, Ambassador Babbitt participated in democratic initiatives in Chile, Guatemala, Venezuela, Nicaragua and Paraguay, as well as in Central Europe and Angola. Ambassador Babbitt was an attorney with Robbins & Green and held a number of legal and financial posts in Arizona. She was a director of Citibank (Arizona) and a member of the Board of Advisors of U.S. West Telephone Company.

In her capacity as Permanent Representative to the OAS, Ambassador Babbitt has chaired a number of key OAS bodies. In 1993-94, she chaired the OAS committee that monitored compliance of the embargo against the military regime in Haiti. For the first three months of 1994, she was chair of the OAS Permanent Council. She is currently chair of a committee that coordinates the organization's implementation of initiatives endorsed by hemispheric leaders at the Summit of the Americas, held in Miami in December 1994.

Ambassador Babbitt is married to Secretary of the Interior Bruce Babbitt. They have two sons, Christopher and T.J.

Nancy Birdsall is president of the Center for Global Development. She was formerly with the Carnegie Endowment for International Peace and director of the Economic Reform Project there. She was the executive vice president of the Inter-American Development Bank (1993-98) and before that director of the policy research department at the World Bank. She is the author of numerous publications on labor markets, human resources, economic inequality, the relationship between income distribution and growth, and other development issues. She serves on various boards, including the Population Council, and is special adviser to the administrator of the United Nations Development Program.

Lawrence Summers is an American economist and academic. He is the 1993 recipient of the John Bates Clark Medal for his work in macroeconomics, was Secretary of the Treasury for the last year and a half of the Bill Clinton administration, and served as the 27th President of Harvard University from 2001 to 2006. He is the nephew of famed economists Paul Samuelson and Kenneth Arrow. Summers resigned his position as president of Harvard University amidst controversy on June 30, 2006, and was replaced by former University President Derek Bok as acting Interim President the next day. Summers returned to the University following a sabbatical for the 2006-07 academic year as one of Harvard's select University Professors. Separately, as announced on October 19, 2006, he became a part-time managing director of the investment and technology development firm D. E. Shaw & Co. and since January 2007 has acted as an advisor to the board of the global economic and financial analysis firm RGE Monitor. He is also a member of the National Academy of Sciences and the influential Washington-based financial advisory body, the Group of Thirty.

Cameron Sinclair is the co-founder and executive director of Architecture for Humanity, a charitable organization which seeks architecture and design solutions to humanitarian crises and provides design services to communities in need. Sinclair was trained as an architect at the University of Westminster and at the Bartlett School of Architecture, University College London. After his studies, he moved to New York where he worked as a designer and project architect. He is a regular lecturer and visiting professor at schools in the United States and abroad and has contributed to a number of exhibitions dealing with social justice and design. He has spoken at a number of international conferences and forums on sustainable development and post disaster reconstruction, including appearances on BBC World Service and CNN International, National Public Radio and PBS.

In 2004 Fortune Magazine named Cameron Sinclair was named as one of the Aspen Seven, seven people changing the world for the better. He was the recipient of the 2006 TED prize and the 2005 RISD/Target Emerging Designer of the Year. Recently he was selected as a Young Global Leader by the World Economic Forum. Along with co-founder Kate Stohr, was awarded the Wired Magazine 2006 Rave Award for Architecture for their work in responding to housing needs following Hurricane Katrina.