Pablo Heras-Casado will conduct the Orchestra of St. Luke's in a program exploring the legacy of the composer and conductor Pierre Boulez, whose works will be performed alongside those of Bruno Mantovani, Heinz Holliger, Philippe Manoury and Marc-Andr� Dalbavie. Mr. Heras-Casado will host the program with Ara Guzelimian, dean of the Juilliard School.