On August 13th 2009 Jon Calame, founding partner of Minerva Partners and co-author of "Divided Cities: Beirut, Jerusalem, Mostar, and Nicosia" (UPenn Press, March 2009), spoke at Neighborhood Preservation Center in New York to explore the logic of violent urban partition along ethnic lines—when it occurs, who supports it, what it costs, and why seemingly healthy cities succumb to it. His field-based investigations are coupled with scholarly research to illuminate the history of urban dividing lines, the social impacts of physical partition, and the assorted professional responses to "self-imposed apartheid."