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.

James Douglas Muir "Jay" Leno /ˈlɛnoʊ/ (born April 28, 1950) is an American stand-up comedian and television host.

From 1992 to 2009, Leno was the host of NBC's The Tonight Show with Jay Leno. Beginning in September 2009, Leno started a primetime talk show, titled The Jay Leno Show, which aired weeknights at 10:00 p.m. (Eastern Time, UTC-5), also on NBC. After The Jay Leno Show was canceled in January 2010 amid a host controversy, Leno returned to host The Tonight Show with Jay Leno on March 1, 2010.

James "Jay" Leno was born in New Rochelle, New York, in 1950. His mother, Catherine (née Muir; 1911–1993), a homemaker, was born in Greenock, Scotland, and came to the United States at age 11. Leno's father, Angelo (1910–1994), who worked as an insurance salesman, was born in New York to immigrants from Flumeri, Italy. Leno grew up in Andover, Massachusetts, and although his high school guidance counselor recommended that he drop out of school, he later obtained a Bachelor's degree in speech therapy from Emerson College, where he started a comedy club in 1973. Leno's siblings include his late older brother, Patrick, who was a Vietnam veteran and a lawyer.

Charles Peete "Charlie" Rose, Jr. (born January 5, 1942) is an American television talk show host and journalist. Since 1991 he has hosted Charlie Rose, an interview show distributed nationally by PBS since 1993. He has also co-anchored CBS This Morning since January 2012. Rose, along with Lara Logan, has hosted the revived CBS classic Person to Person, a news program during which celebrities are interviewed in their homes, originally hosted from 1953 to 1961 by Edward R. Murrow.

Rose was born in Henderson, North Carolina, the only child of Margaret Frazier and Charles Peete Rose, Sr., tobacco farmers who owned a country store. As a child, Rose lived above his parents' store in Henderson and helped out with the family business from age seven. Rose admitted in a Fresh Dialogues interview that as a child his insatiable curiosity was constantly getting him in trouble. A high school basketball star, Rose entered Duke University intending to pursue a degree with a pre-med track, but an internship in the office of Democratic North Carolina Senator B. Everett Jordan got him interested in politics. Rose graduated in 1964 with a bachelor's degree in history. At Duke, he was a member of the Kappa Alpha Order fraternity. He earned a Juris Doctor from the Duke University School of Law in 1968. He met his wife, Mary (née King), while attending Duke.

Nelson Rolihlahla Mandela (Xhosa pronunciation: [xoˈliːɬaɬa manˈdeːla]; born 18 July 1918) is a South African politician who served as President of South Africa from 1994 to 1999, the first ever to be elected in a fully representative democratic election. Before being elected President, Mandela was a militant anti-apartheid activist, and the leader and co-founder of Umkhonto we Sizwe, the armed wing of the African National Congress (ANC). In 1962 he was arrested and convicted of sabotage and other charges, and sentenced to life imprisonment. Mandela went on to serve 27 years in prison, spending many of these years on Robben Island. Following his release from prison on 11 February 1990, Mandela led his party in the negotiations that led to the establishment of democracy in 1994. As President, he frequently gave priority to reconciliation, while introducing policies aimed at combating poverty and inequality in South Africa.

In South Africa, Mandela is often known as Madiba, his Xhosa clan name; or as tata (Xhosa: father). Mandela has received more than 250 awards over four decades.

William Sanford "Bill" Nye (born November 27, 1955), popularly known as Bill Nye the Science Guy, is an American science educator, comedian, television host, actor, mechanical engineer, and scientist. He is best known as the host of the Disney/PBS children's science show Bill Nye the Science Guy (1993–1998) and for his many subsequent appearances in popular media as a science educator.

William Sanford Nye was born in Washington, D.C., the son of Jacqueline (née Jenkins; c. 1920–2000), a codebreaker during World War II, and Edwin Darby "Ned" Nye (died 1997), also a World War II veteran whose experience in a Japanese prisoner of war camp led him to become a sundial enthusiast. Nye is a fourth-generation Washington, D.C. resident on his father's side of the family. After attending Lafayette Elementary and Alice Deal Junior High in the city, he was accepted to the private Sidwell Friends School on a partial scholarship, graduating in 1973. He studied mechanical engineering at Cornell University, where one of his professors was Carl Sagan, and graduated with a Bachelor of Science in 1977. He was awarded an honorary doctorate by The Johns Hopkins University in May 2008. In May 2011, Nye was awarded an Honorary Doctor of Science degree from Willamette University where he was the keynote speaker for that year's commencement exercises.