William Howard Taft, the 27th president of the United States, fulfilled a lifelong dream when he was appointed chief justice of the Supreme Court, becoming the only person to have served as both a U.S. chief justice and president.

Lyndon B. Johnson was elected vice president of the U.S. in 1960 and became the 36th president in 1963, following the assassination of President John F. Kennedy.

Richard Nixon was the 37th U.S. president and the only commander-in-chief to resign from his position, after the 1970s Watergate scandal.

The 41st president of the United States, George H.W. Bush served as vice president under Ronald Reagan. He is the father of George W. Bush, the 43rd president.

Dwight D. Eisenhower, 34th president of the United States, promoted Atoms for Peace at the United Nations General Assembly in order to ease Cold War tensions.

Sworn in as the 33rd president after Franklin Delano Roosevelt's sudden death, Harry S. Truman presided over the end of WWII and dropped the atomic bomb on Japan.

Bill Clinton was the 42nd president of the United States, and the second to be impeached. He oversaw the country's longest peacetime economic expansion.

Barack Obama is the 44th and current president of the United States, and the first African American to serve as U.S. president. First elected to the presidency in 2008, he won a second term in 2012.