This man collaborated with Richard Foster on a modern art museum in Washington, D.C. and with John Burgee to design two buildings that each have an inclination of 15 degrees. This designer of such works as the Gate of Europe in Madrid and the Kreeger museum continued such collaborations by working with Foster to design the 
This man collaborated with Richard Foster on a modern art museum in Washington, D.C. and with John Burgee to design two buildings that each have an inclination of 15 degrees. This designer of such works as the Gate of Europe in Madrid and the Kreeger museum continued such collaborations by working with Foster to design the David H. Koch theater in Lincoln and working with Burgee to design a complex inspired by Charles Klauder's Cathedral of Learning, a building complex noted for its (*) 231 spires. Other works by this man include a glass mega-church in Garden Grove, California, a personal residence in New Canaan, Connecticut and a Park Avenue skyscraper built in the international style. For 10 points, name this American architect known for such works as the PPG Place, the Glass House and his collaboration with Mies van der Rohe, the Seagram Building.
This man collaborated with Richard Foster on a modern art museum in Washington, D.C. and with John Burgee to design two buildings that each have an inclination of 15 degrees.
Philip {Johnson}