On 18 July 2007 in Johannesburg, South Africa, Nelson Mandela, Graça Machel, and Tutu convened The Elders, a group of world leaders to contribute their wisdom, leadership and integrity to tackle some of the world's toughest problems. Mandela announced its formation in a speech on his 89th birthday. Tutu is serving as its Chair. Other founding members include Kofi Annan, Ela Bhatt, Gro Harlem Brundtland, Jimmy Carter, Li Zhaoxing, Mary Robinson, Muhammad Yunus and Aung San Suu Kyi, whose chair was left symbolically empty due to her confinement as a political prisoner in Burma.