The husband-and-wife architecture team, Tod Williams and Billie Tsien, have been selected to design the Obama Presidential Center in Chicago. The New York-based firm, which focuses on institutions, including museums and schools, has designed the Barnes Foundation in Philadelphia and the C.V. Starr East Asian Library at the University of California, Berkeley. Tsien and Williams beat out six other firms, all of whom had presented conceptual designs. The project is slated for completion in 2021.