
- In 2007, he was appointed the first president of the Economic Community of West African States by the governments of its member states, serving a four-year term.
- Two years later, Chambas was named secretary-general of the African, Caribbean and Pacific Group of States (ACP), a security and economic cooperation organization of 79 countries. In that role, he aided in the ACP’s economic recovery and helped forge the organization’s agreement to join the European Union in 2020.
- In 2013, Chambas was appointed joint special representative of the African Union to the United Nations Hybrid Operation in Darfur.