For 10 points—name this designer of the John Hancock Tower, who also designed an infamous Glass Pyramid outside the Louvre.
He used reinforced concrete and glass to achieve a tent-like structure on a hexagonal base for the Luce Memorial Chapel, while a spiraling complex leads to a wedge-like structure connected to an elliptical glass room where a large American flag hangs from the ceiling in his John F. Kennedy Library.  A tiltled rectangular building that is seemingly held off the ground by large stone pillars comprises his design for the Dallas City Hall, while he claimed that he designed one building to look as though it were "carved out of the mountain".  This designer of the National Center for Atmospheric Research also designed a building which had early problems when the wind blew out many of the glass panes.  For 10 points—name this designer of the John Hancock Tower, who also designed an infamous Glass Pyramid outside the Louvre.
He used reinforced concrete and glass to achieve a tent-like structure on a hexagonal base for the Luce Memorial Chapel, while a spiraling complex leads to a wedge-like structure connected to an elliptical glass room where a large American flag hangs from the ceiling in his John F. Kennedy Library.  
{I.M. Pei}