Dan Kiley (1912-2004) was an American landscape architect who did much to further the modern idiom in his field. Though he studied at Harvard University he left before completing his degree, then returned to school to become a licensed architect at the behest of Louis Kahn. He was a contemporary and friend of noted modernist landscape designers Garrett Eckbo and James Rose, and his career got its first big break when he won the competition to design the grounds at the Jefferson National Expansion Memorial, site of Eero Saarinen's famed Gateway Arch. His other important works include Lincoln Center in New York, the US Air Force Academy in Colorado Springs, the John F. Kennedy Library in Boston, and the National Center for Atmospheric Research in Boulder, Colorado.