Bill Clinton: President Clinton started his academic career at Georgetown University before studying at Oxford and Yale, and it was at Georgetown that he became a member of Alpha Phi Omega, the biggest fraternity in the United States. (It boasts chapters at more than 350 schools with close to 17,000 current active members, not to mention hundreds of thousands of alumni.) Interestingly, APO is a co-ed service fraternity, open to men and women.
George H.W. Bush: The 41st president of the United States, George H.W. Bush studied at Yale after serving in the military during World War II. While there, he became a brother in Delta Kappa Epsilon, and he also served as president of the fraternity. The organization has multiple ties with the presidency, including Bush's son, George W. Bush, who was also a member.
Martin Luther King, Jr.: Alpha Phi Alpha is the first Greek-letter organization created by African-American students, and it was founded at Cornell University in December 1906. Dr. King earned his bachelor's degree in sociology from Morehouse and was a member of Alpha Phi Alpha. In 1956, for its 50th anniversary, fraternity members gathered at Cornell, where King delivered a keynote address on social justice and integration.
Thurgood Marshall: Thurgood Marshall was a pioneer: the first African-American to sit on the Supreme Court, he's also known for successfully arguing multiple cases before the Court as well as his landmark victory in Brown v. Board of Education. He was also a member of Alpha Phi Alpha and studied at Lincoln University and Howard University School of Law.
Elizabeth Dole: Wife of former Senate Majority Leader (and one-time presidential nominee) Bob Dole, Elizabeth Dole served as a senator from North Carolina, and before that worked as secretary of labor under George H.W. Bush and secretary of transportation during Ronald Reagan's second term. She's also a member of Delta Delta Delta — aka Tri Delta — which was founded at Boston University in 1888 and is one of the biggest and oldest women's groups in the world.
Ruth Bader Ginsburg: Ginsburg is a Supreme Court justice and only the second female to sit on the bench in history, and she's also a sorority sister. Ginsburg belongs to Alpha Epsilon Phi, which was founded at New York's Barnard College in 1909.
Grace Coolidge: The wife of President Calvin Coolidge, Grace Coolidge was first lady from 1923-1929, during which time she was known as a devoted wife and hostess for all manner of functions, including a party thrown at the White House for Charles Lindbergh to celebrate his 1927 transatlantic flight. She studied at the University of Vermont, where she was a founding member of a chapter of Pi Beta Phi.
Carrie Chapman Catt: Catherine Chapman Catt was a key figure in the suffrage movement of the early 20th century. She founded the League of Women Voters and the International Alliance of Women, she served as president of the National American Woman Suffrage Association, and she helped champion the passage of the 19th Amendment, which gave women the right to vote. She graduated from what was then Iowa State College and is a member of Pi Beta Phi.
Condoleezza Rice: National Security Advisor during George W. Bush's first term and Secretary of State during his second, Condoleezza Rice studied at the University of Denver before earning a master's degree from the University of Notre Dame. She's a member of Alpha Chi Omega, a woman's group dating back to 1885 that now has more than 130 chapters nationwide.
Karen Hughes: Karen Hughes worked with George W. Bush on his gubernatorial campaign and again as counselor once he became president, eventually being appointed Undersecretary of State for Public Diplomacy. She graduated in 1977 from Southern Methodist University, where she was a member of Alpha Delta Pi, a sorority founded in 1851 at Georgia's Wesleyan College.
Fred M. Vinson: Fred Vinson holds a unique place in American history: he was the first man to serve in all three branches of government. He was a member of the House of Representatives for the legislative branch; the Secretary of the Treasury under President Truman for the executive branch; and Chief Justice of the Supreme Court (appointed by Truman) for the judicial branch. He graduated at the top of his class from Centre College, where he was a member of Phi Delta Theta.
Franklin D. Roosevelt: Like his cousin, Theodore, Franklin Roosevelt was a fraternity man whose leadership skills would take him to the White House. FDR attended Harvard University and served as president of the paper, The Harvard Crimson, while also being an active member of Alpha Delta Phi.
Theodore Roosevelt: Teddy Roosevelt took the office of the presidency while his cousin Franklin was in college. He was active in Alpha Delta Phi and Delta Kappa Epsilon.
Ronald Reagan: Tau Kappa Epsilon was created in 1899 at Illinois Wesleyan University and now has chapters throughout the country and in Canada. When Ronald Reagan attended Eureka College before graduating in 1932, he was a member of TKE and active in a variety of campus activities.
Warren Buffett: Warren Buffet, who studied at the University of Pennsylvania and the University of Nebraska-Lincoln, is the CEO of Berkshire Hathaway and one of the richest people on the planet. He's also a member of Alpha Sigma Phi, a fraternity founded at Yale University in 1845, making it one of the oldest in the nation.
Ann S. Moore: Ann Moore currently serves as the chair and CEO of Time, Inc., and is the company's first female CEO. She did her undergrad studies at Vanderbilt University and is an alumna of Pi Beta Phi, which began at Monmouth College in Illinois in 1867. Pi Beta Phi has more than 130 active chapters throughout the U.S. and Canada.
Alice Sheets Marriott: Alice Sheets Marriott was the wife of J. Willard Marriott, founder of a chain of hotels you might have heard of. She worked alongside her husband as they began their business ventures at a root beer stand that spun into several restaurants and later at their first motel in Virginia, which would eventually morph into the chain of Marriott hotels worldwide. She graduated from the University of Utah in 1927, and while there she was a member of Chi Omega, which began at the University of Arkansas in 1895. Today it's the biggest member of the National Panhellenic Conference, a group composed of 26 sororities.
Jerry Yang: The founder and CEO of Yahoo has an impressive academic history, with bachelor's and master's degrees in electrical engineering from Stanford University. While studying, he also found time to be a member of Phi Kappa Psi, formed in 1852 at Jefferson College in Pennsylvania.
Paul Allen: Microsoft has been a giant in the field of computers for so long that it's hard to remember a time without them. But Paul Allen remembers that time, since he and Bill Gates were the ones who co-founded the company. Allen attended Washington State University, and though he didn't graduate, he did have time to pledge Phi Kappa Theta, a fraternity established in 1959 by the merging of Phi Kappa and Theta Kappa Phi. PKT also made President Kennedy an honorary member.
Conrad M. Hilton: The founder of a global hotel chain and great-grandfather to Paris Hilton — an interesting pair of claims to fame — Conrad Hilton was a fantastically successful businessman who built a financial empire beginning with a small hotel in Cisco, Texas. He studied at the New Mexico Military Institute and what would become New Mexico Tech, and was a member of Tau Kappa Epsilon.
Sports and Sciences
Neil Armstrong: He's the first person to set foot on the Moon, as well as one of the first U.S. citizens to make a space flight. As mission commander of Apollo 11, he made history by landing on the Moon, and he received the Congressional Space Medal of Honor. He studied engineering at Purdue University, where he was in two fraternities: Phi Delta Theta, founded at Miami University in 1848, and Kappa Kappa Psi, a national honorary band fraternity.
Phil Jackson: The current coach of the Los Angeles Lakers is considered one of the best in NBA history. He started his career playing for the New York Knicks and New Jersey Nets before transitioning to coaching roles, including legendary work with Jordan-era Chicago Bulls before moving to California. He played college ball at the University of North Dakota, where he was also a member of Sigma Alpha Epsilon. SAE was founded in 1856 at the University of Alabama and boasts more than 290,000 initiated members.
Eli Manning: The New York Giants quarterback led his team to an upset victory in Super Bowl XLII in 2008 against the previously undefeated New England Patriots. He started his amazing career at Ole Miss, where in addition to football he also was a devoted member of Sigma Nu, a frat founded in 1869 by a trio of cadets at the Virginia Military Institute.
Pat Riley: Pat Riley is widely regarded as one of the greatest basketball coaches in history, having worked as the head coach for five separate championship teams. While playing ball at the University of Kentucky, he was active in Sigma Nu.
Robert Ballard: A former U.S. Navy commander, Robert Ballard is best known for his ocean explorations, namely his discovery of the wreckage of the Titanic in 1985. He also discovered the wrecks of the Bismarck and Yorktown. He's a world leader in the field of undersea exploration, and he got his start as a member of Sigma Alpha Epsilon at the University of California, Santa Barbara, where he studied chemistry and geology.