Wendy Lesser's "You Say to Brick: The Life of Louis Kahn" is a major exploration of the architect's life and work. Born in Estonia 1901 and brought to America in 1906, the architect Louis Kahn grew up in poverty in Philadelphia. By the time of his mysterious death in 1974, he was widely recognized as one of the greatest architects of his era. Yet this enormous reputation was based on only a handful of masterpieces, all built during the last fifteen years of his life. Kahn, perhaps more than any other twentieth-century American architect, was a "public" architect. Rather than focusing on corporate commissions, he devoted himself to designing research facilities, government centers, museums, libraries, and other structures that would serve the public good. But this warm, captivating person, beloved by students and admired by colleagues, was also a secretive man hiding under a series of masks.