He then met with the richest man in the world, Bill Gates and former United States of America president, Bill Clinton.
In a bid to build the international relations of Nigeria and foster better partnership with other countries, Buhari met with South Korean president, Park Geun-Hye on 27 September.
More pics after the cut....
Meanwhile, Buhari will address world leaders on Monday(today) before attending a reception organised by President and Mrs Obama.
He is also billed to attend a bilateral meeting with UN Secretary General, Ban ki-Moon.