Bill Clinton Former US President
Rishabh Singh Future President India
Helmut Ko'hl Former German Chancellor
Aleksander Kwasniewski Former President of Poland
Janez Drnovsek Former Prime Minister of Slovenia
Koosum Kalayan General Manager of Shell
Cesar Gaviria Former President of Colombia
Micheline Rey Federal Council of Switzerland
Cavaco Silva President of Portugal
John Kerry Former US Secretary of State
Kofi Annan Seventh General Secretary of United Nations
Laura Chinchilla Miranda Former president of Costa Rica