The Group of Twenty Finance Ministers and Central Bank Governors (also known as the G-20, G20, and Group of Twenty) is a group of finance ministers and central bank governors from 20 major economies: 19 countries plus the European Union, which is represented by the President of the European Council and by the European Central Bank. Their heads of government or heads of state have also periodically conferred at summits since their initial meeting in 2008. Collectively, the G-20 economies account for more than 80 percent of the gross world product (GWP), 80 percent of world trade (including EU intra-trade), and two-thirds of the world population. They furthermore account for 84.1 percent and 82.2 percent of the world's economic growth by nominal GDP and GDP (PPP) respectively from the years 2010 to 2016, according to the International Monetary Fund (IMF).

The G-20 was proposed by former Canadian Finance Minister Paul Martin (later, Prime Minister) for cooperation and consultation on matters pertaining to the international financial system. It studies, reviews, and promotes discussion (among key industrial and emerging market countries) of policy issues pertaining to the promotion of international financial stability, and seeks to address issues that go beyond the responsibilities of any one organization. With the G-20 growing in stature since the 2008 Washington summit, its leaders announced on September 25, 2009, that the group will replace the G8 as the main economic council of wealthy nations.

Barack Hussein Obama II (ⁱ/bəˈrɑːk huːˈseɪn oʊˈbɑːmə/; born August 4, 1961) is the 44th and current President of the United States. He is the first African American to hold the office. In January 2005, Obama was sworn in as a U.S. Senator in the state of Illinois. He would hold this office until November 2008, when he resigned following his victory in the 2008 presidential election.

Born in Honolulu, Hawaii, Obama is a graduate of Columbia University and Harvard Law School, where he was the president of the Harvard Law Review. He was a community organizer in Chicago before earning his law degree. He worked as a civil rights attorney in Chicago and taught constitutional law at the University of Chicago Law School from 1992 to 2004. He served three terms representing the 13th District in the Illinois Senate from 1997 to 2004.

Following an unsuccessful bid against the Democratic incumbent for a seat in the United States House of Representatives in 2000, Obama ran for the United States Senate in 2004. Several events brought him to national attention during the campaign, including his victory in the March 2004 Illinois Democratic primary for the Senate election and his keynote address at the Democratic National Convention in July 2004. He won election to the U.S. Senate in Illinois in November 2004. His presidential campaign began in February 2007, and after a close campaign in the 2008 Democratic Party presidential primaries against Hillary Rodham Clinton, he won his party's nomination. In the 2008 presidential election, he defeated Republican nominee John McCain, and was inaugurated as president on January 20, 2009. Nine months later, Obama was named the 2009 Nobel Peace Prize laureate. In April 2011, he announced that he would be running for re-election in 2012.

Cristina Elisabet Fernández de Kirchner (Spanish pronunciation: [kɾisˈtina eˈlisaβet ferˈnandes ðe ˈkiɾʃneɾ]; born 19 February 1953), commonly known as Cristina Fernández or Cristina Kirchner, is the 55th and current President of Argentina and the widow of former President Néstor Kirchner. She is Argentina's first elected female president, the second female president ever to serve (after Isabel Martínez de Perón, 1974–1976) and the first woman ever reelected. A Justicialist, Fernández served one term as National Deputy and three terms as National Senator for both Santa Cruz and Buenos Aires provinces.

A native of La Plata, Buenos Aires, Fernández is a graduate of the National University of La Plata. She met her husband during her studies, and they moved to Santa Cruz to work as lawyers. In May 1991, she was elected to the provincial legislature. Between 1995 and 2007, she was repeatedly elected to the Argentine National Congress, both as a National Deputy and National Senator. During Kirchner's presidency (2003–2007) she acted as First Lady. Fernández was chosen as the Front for Victory presidential candidate in 2007.

Dilma Vana Rousseff (Brazilian Portuguese: [ˈdʒiwmɐ χuˈsɛf] born 14 December 1947) is the 36th and current President of Brazil. She is the first woman to hold the office. Prior to that, in 2005, she was also the first woman to become Chief of Staff to the President of Brazil, appointed by then President Luiz Inácio Lula da Silva.

The daughter of a Bulgarian entrepreneur, Rousseff was raised in an upper middle class household in Belo Horizonte. She became a socialist during her youth, and following the 1964 coup d'état joined various left-wing and Marxist urban guerrilla groups that fought against the military dictatorship. Rousseff was captured and jailed between 1970 and 1972 and reportedly tortured.

After her release, Rousseff rebuilt her life in Porto Alegre with Carlos Araújo, who would be her partner for 30 years. Both helped found the Democratic Labour Party (PDT) in Rio Grande do Sul, participating in several of the party's electoral campaigns. She became the Secretary of the Treasury of the city of Porto Alegre in the Alceu Collares administration, and later the Secretary of Energy of the State of Rio Grande do Sul under both Collares and Olívio Dutra administrations. In 2000, after an internal dispute in the Dutra cabinet, she left PDT and joined the Workers' Party (PT).