Question: What Columbia President went to the employer of the designer of Stillman House?

full_context: Document 1: Harvard Five: They were all influenced by Walter Gropius, who founded the Bauhaus in 1919, and thereafter became head of the architecture program at Harvard.
Document 2: Harvard University: Politics: U.N. Secretary General Ban Ki-moon; American political leaders John Hancock, John Adams, John Quincy Adams, Rutherford B. Hayes, Theodore Roosevelt, Franklin D. Roosevelt, John F. Kennedy, Al Gore, George W. Bush and Barack Obama; Chilean President Sebastián Piñera; Colombian President Juan Manuel Santos; Costa Rican President José María Figueres; Mexican Presidents Felipe Calderón, Carlos Salinas de Gortari and Miguel de la Madrid; Mongolian President Tsakhiagiin Elbegdorj; Peruvian President Alejandro Toledo; Taiwanese President Ma Ying-jeou; Canadian Governor General David Lloyd Johnston; Indian Member of Parliament Jayant Sinha; Albanian Prime Minister Fan S. Noli; Canadian Prime Ministers Mackenzie King and Pierre Trudeau; Greek Prime Minister Antonis Samaras; Israeli Prime Minister Benjamin Netanyahu; former Pakistani Prime Minister Benazir Bhutto; U. S. Secretary of Housing and Urban Development Shaun Donovan; Canadian political leader Michael Ignatieff; Pakistani Members of Provincial Assembly Murtaza Bhutto and Sanam Bhutto; Bangladesh Minister of Finance Abul Maal Abdul Muhith; President of Puntland Abdiweli Mohamed Ali; U.S. Ambassador to the European Union Anthony Luzzatto Gardner.
Document 3: University of Chicago: Notable alumni in the field of government and politics include the founder of modern community organizing Saul Alinsky, Obama campaign advisor and top political advisor to President Bill Clinton David Axelrod, Attorney General and federal judge Robert Bork, Attorney General Ramsey Clark, Prohibition agent Eliot Ness, Supreme Court Justice John Paul Stevens, Prime Minister of Canada William Lyon Mackenzie King, 11th Prime Minister of Poland Marek Belka, Governor of the Bank of Japan Masaaki Shirakawa, the first female African-American Senator Carol Moseley Braun, United States Senator from Vermont and 2016 Democratic Presidential Candidate Bernie Sanders, and former World Bank President Paul Wolfowitz.
Document 4: Historical rankings of presidents of the United States: According to a Rasmussen poll conducted in 2007, six presidents -- George Washington, Abraham Lincoln, Thomas Jefferson, Theodore Roosevelt, Franklin D. Roosevelt, and John F. Kennedy -- were rated favorably by at least 80% of Americans.
Document 5: Harvard University: Other: Civil rights leader W. E. B. Du Bois; philosopher Henry David Thoreau; authors Ralph Waldo Emerson and William S. Burroughs; educators Werner Baer, Harlan Hanson; poets Wallace Stevens, T. S. Eliot and E. E. Cummings; conductor Leonard Bernstein; cellist Yo Yo Ma; pianist and composer Charlie Albright; composer John Alden Carpenter; comedian, television show host and writer Conan O'Brien; actors Tatyana Ali, Nestor Carbonell, Matt Damon, Fred Gwynne, Hill Harper, Rashida Jones, Tommy Lee Jones, Ashley Judd, Jack Lemmon, Natalie Portman, Mira Sorvino, Elisabeth Shue, and Scottie Thompson; film directors Darren Aronofsky, Terrence Malick, Mira Nair, and Whit Stillman; architect Philip Johnson; musicians Rivers Cuomo, Tom Morello, and Gram Parsons; musician, producer and composer Ryan Leslie; serial killer Ted Kaczynski; programmer and activist Richard Stallman; NFL quarterback Ryan Fitzpatrick; NFL center Matt Birk; NBA player Jeremy Lin; US Ski Team skier Ryan Max Riley; physician Sachin H. Jain; physicist J. Robert Oppenheimer; computer pioneer and inventor An Wang; Tibetologist George de Roerich; and Marshall Admiral Isoroku Yamamoto.
Document 6: Hermann Muthesius: Adam Gottlieb Hermann Muthesius (20 April 1861 – 29 October 1927), known as Hermann Muthesius, was a German architect, author and diplomat, perhaps best known for promoting many of the ideas of the English Arts and Crafts movement within Germany and for his subsequent influence on early pioneers of German architectural modernism such as the Bauhaus.
Document 7: Villa Stein: Villa Stein, designed by Le Corbusier, was built in 1927 at Garches, France. The building is also known as Villa Garches, Villa de Monzie, and Villa Stein-de Monzie.
Document 8: Walter Rudin House: The Walter Rudin House is a Frank Lloyd Wright-designed Marshall Erdman prefab building located at 110 Marinette Trail, Madison, Wisconsin. Designed in 1957, it is the first of the only two examples of the second type (known as Prefab #2) of the Marshall Erdman Prefab Houses. This house and the James McBean Residence have the same floor plan and vary only in minor details such as paint color and siting. Construction was completed in June, 1959 and the house was sold to UW-Madison mathematicians Walter and Mary Ellen Rudin. Now, Dr. Thomas Littlefield and Rachel Betzen live there with their two children.
Document 9: Washington University in St. Louis: The Mildred Lane Kemper Art Museum, established in 1881, is one of the oldest teaching museums in the country. The collection includes works from 19th, 20th, and 21st century American and European artists, including George Caleb Bingham, Thomas Cole, Pablo Picasso, Max Ernst, Alexander Calder, Jackson Pollock, Rembrandt, Robert Rauschenberg, Barbara Kruger, and Christian Boltanski. Also in the complex is the 3,000 sq ft (300 m2) Newman Money Museum. In October 2006, the Kemper Art Museum moved from its previous location, Steinberg Hall, into a new facility designed by former faculty member Fumihiko Maki. Interestingly, the new Kemper Art Museum is located directly across from Steinberg Hall, which was Maki's very first commission in 1959.
Document 10: Wassily Chair: The Wassily Chair, also known as the Model B3 chair, was designed by Marcel Breuer in 1925-1926 while he was the head of the cabinet-making workshop at the Bauhaus, in Dessau, Germany.
Document 11: Stillman House: Stillman House (1950) follows Marcel Breuer’s Gregory Ain demonstration “House in the Garden” built the year before for the MOMA Museum, which now sits at the Rockefeller Kykuit estate in Hudson Valley, NY. The Stillman house boasts three separate architectural commissions by Breuer between 1950-1953: a main house, a studio, and pool and porch redesign, with the latter featuring an 18’x10’ pool mural wall by friend and sculptor, Alexander Calder. During this time, fellow first-generation Bauhaus friend and artist, Xanti Schawinsky, executed an interior mural wall as well.
Document 12: Harvard University: Established originally by the Massachusetts legislature and soon thereafter named for John Harvard (its first benefactor), Harvard is the United States' oldest institution of higher learning, and the Harvard Corporation (formally, the President and Fellows of Harvard College) is its first chartered corporation. Although never formally affiliated with any denomination, the early College primarily trained Congregationalist and Unitarian clergy. Its curriculum and student body were gradually secularized during the 18th century, and by the 19th century Harvard had emerged as the central cultural establishment among Boston elites. Following the American Civil War, President Charles W. Eliot's long tenure (1869–1909) transformed the college and affiliated professional schools into a modern research university; Harvard was a founding member of the Association of American Universities in 1900. James Bryant Conant led the university through the Great Depression and World War II and began to reform the curriculum and liberalize admissions after the war. The undergraduate college became coeducational after its 1977 merger with Radcliffe College.
Document 13: Rosenbaum House: The Rosenbaum House is a single-family house designed by architect Frank Lloyd Wright and built for Stanley and Mildred Rosenbaum in Florence, Alabama. A noted example of his Usonian house concept, it is the only Wright building in Alabama, and is one of only 26 pre-World War II Usonian houses. Wright scholar John Sergeant called it "the purest example of the Usonian."
Document 14: Harvard University: Harvard operates several arts, cultural, and scientific museums. The Harvard Art Museums comprises three museums. The Arthur M. Sackler Museum includes collections of ancient, Asian, Islamic and later Indian art, the Busch-Reisinger Museum, formerly the Germanic Museum, covers central and northern European art, and the Fogg Museum of Art, covers Western art from the Middle Ages to the present emphasizing Italian early Renaissance, British pre-Raphaelite, and 19th-century French art. The Harvard Museum of Natural History includes the Harvard Mineralogical Museum, Harvard University Herbaria featuring the Blaschka Glass Flowers exhibit, and the Museum of Comparative Zoology. Other museums include the Carpenter Center for the Visual Arts, designed by Le Corbusier, housing the film archive, the Peabody Museum of Archaeology and Ethnology, specializing in the cultural history and civilizations of the Western Hemisphere, and the Semitic Museum featuring artifacts from excavations in the Middle East.
Document 15: Caribbean and Central America Action: Among the public figures speaking at the 33rd conference, held in 2009 in Miami, were the Prime Minister of Haiti, Jean-Max Bellerive, Canada's Minister of State of Foreign Affairs, Peter Kent and Puerto Rico's Secretary of State, Kenneth McClintock. The organization's policy-oriented programs have focused on tourism, financial services, policy and regulatory environments for business in the Americas, energy security, maritime port security, disaster mitigation, customs, telecommunications, intellectual property rights, information technology, agriculture and telecommunications. Cabinet-level officials have represented the United States at prior conferences.
ground_truth: Juan Manuel Santos
sub_queries: What architect designed Stillman House? Answer: Marcel Breuer
Marcel Breuer >> employer Answer: Harvard
What Columbia President went to Harvard ? Answer: Juan Manuel Santos