The architectural firm Moshe Safdie and Associates, Inc. was established in Montreal in 1964 to design and supervise the construction of Habitat 67, the famous modular housing complex based on Moshe Safdie's master's thesis at McGill University and built as part of the 1967 World's Fair. Today the firm has offices in Boston and Jerusalem, and is still headed by Moshe Safdie, the prolific designer and writer who served as director of the Urban Design Program at Harvard's Graduate School of Design from 1978 to 1993. Moshe Safdie and Associates has received international attention for its many celebrated building designs including Vancouver's Library Square, the National Gallery of Canada, Hebrew Union College in Jerusalem, the 2003 expansion of the Peabody Essex Museum in Massachusetts, the Skirball Cultural Center in Los Angeles, and Salt Lake City's Main Library.