paragraph_text: Haus Wittgenstein, (also known as the Stonborough House and the Wittgenstein House) is a house in the modernist style on the Kundmanngasse, Vienna, Austria. The house was commissioned by Margaret Stonborough-Wittgenstein, who asked the architect Paul Engelmann to design a townhouse for her. Stonborough-Wittgenstein invited her brother, the philosopher Ludwig Wittgenstein, to help with the design.

paragraph_text: The Trenton Bath House is a pivotal, influential design by the architect Louis Kahn, with the help of his associate, renowned architect Anne Tyng, at 999 Lower Ferry Road, Ewing Township, Mercer County, New Jersey, United States. It was listed in the National Register of Historic Places in 1984.

paragraph_text: Designed by Melbourne architect Kerstin Thompson from 1999–2002, House at Lake Connewarre is located in Leopold, Victoria. It is a house characterised by its black, flat, long roof blending into the landscape around Lake Connewarre. The architect described the house as “a simple gesture across the landscape”. The house is an attempt to create dialogue with nature in a poetic way and the house design is strongly influenced by the landscape.

paragraph_text: House VI, or the Frank Residence, is a significant building designed by Peter Eisenman, completed in 1975. His second built work, the getaway house, located on Great Hollow Road near Bird's Eye Brook in Cornwall, Connecticut (across from Mohawk Mountain Ski Area) has become famous for both its revolutionary definition of a "house" as much as for the physical problems of design and difficulty of use. At the time of construction, the architect was known almost exclusively as a theorist and "paper architect," promulgating a highly formalist approach to architecture he calls "postfunctionalism." Rather than form following function or an aesthetic design, the design emerged from a conceptual process, and remains pinned to that conceptual framework.

paragraph_text: 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.

paragraph_text: The Unité d'habitation (, "Housing Unit") is a modernist residential housing design principle developed by Le Corbusier, with the collaboration of painter-architect Nadir Afonso. The concept formed the basis of several housing developments designed by him throughout Europe with this name. The most famous of these developments is located in south Marseille.

paragraph_text: Kingo Houses is a housing development designed by architect Jørn Utzon in Helsingør, Denmark. The development consists of 60 L-shaped houses based upon the design of traditional Danish farmhouses with central courtyards and those of Chinese and Islamic dwellings.

paragraph_text: The Kraus House, also known as the Frank Lloyd Wright House in Ebsworth Park, is a house in Kirkwood, Missouri designed by architect Frank Lloyd Wright. The house was designed and constructed for Russell and Ruth Goetz Kraus, and the initial design was conceived in 1950. Construction continued until at least 1960 and was never formally completed. The owners lived in the house for about 40 years (Ruth died in 1992).

paragraph_text: 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.

paragraph_text: The Stahl House (also known as Case Study House #22) is a modernist-styled house designed by architect Pierre Koenig in the Hollywood Hills section of Los Angeles, California, which is known as a frequent set location in American films. Photographic and anecdotal evidence suggests that the architect's client, Buck Stahl, may have provided an inspiration for the overall structure. In 2013 it was listed on the National Register of Historic Places.

paragraph_text: Walmer Crescent, situated in Cessnock, Glasgow, Scotland, consists of a curved row of spacious tenement flats and houses, designed by the architect Alexander Thomson and built between 1857 and 1862.

paragraph_text: The Robert Mills House, also known as Robert Mills Historic House and Park or the Ainsley Hall House, is a historic house museum at 1616 Blanding Street in Columbia, South Carolina. Built in 1823 to a design by Robert Mills, it was designated a National Historic Landmark in 1973 for its architectural significance. The Historic Columbia Foundation owns and operates the home, which has been furnished with decorative arts of the early 19th century, including American Federal, English Regency, and French Empire pieces.

paragraph_text: Villa Fallet is a house located in La Chaux-de-Fonds, Switzerland designed by noted architect Le Corbusier. It was his first commission as an architect at the age of 18. It was completed in 1905. It is recognised as a building of cultural significance in Switzerland.

paragraph_text: The House at 21 Chestnut Street is one of the best preserved Italianate houses in Wakefield, Massachusetts. It was built c. 1855 to a design by local architect John Stevens, and was home for many years to local historian Ruth Woodbury. The house was listed on the National Register of Historic Places in 1989.

paragraph_text: Marshall House has been the President's Lodge at Lucy Cavendish College, Cambridge, England, since 2001. It was designed by the Scottish architect J. J. Stevenson and built in 1886.

paragraph_text: The Großes Festspielhaus (Large Festival House), in its current form, was designed by architect Clemens Holzmeister in 1956 for the Salzburg Festival in

paragraph_text: They were all influenced by Walter Gropius, who founded the Bauhaus in 1919, and thereafter became head of the architecture program at Harvard.

paragraph_text: High Hollow, also known as the George Howe House, is a historic Chestnut Hill residence in Northwest Philadelphia designed and built by American architect George Howe.

paragraph_text: The Daeyang Gallery and House, designed by Steven Holl Architects, is located in the Kangbuk neighborhood of Seoul, South Korea.

paragraph_text: The Kaufmann House (or Kaufmann Desert House) is a house located in Palm Springs, California, that was designed by architect Richard Neutra in 1946.

Question: What Columbia President went to the employer of the designer of Stillman House?
Answer: Juan Manuel Santos