Henry Grabar is a journalist who writes about cities, systems, maps and machines. He’s a staff writer at Slate. Previously, he was the senior editor at Urban Omnibus, the magazine of the Architectural League of New York, and the author of the Science of Cities column for Next City and the Dream City column for Salon. He has written about disaster preparation in Boston, coastal flooding in Long Island, embassy architecture in Cairo, historic preservation in Havana, war monuments in Sarajevo, and air pollution in Mexico City. He has lingered with the cutthroat Christmas tree salesmen of New York City, traced the literary history of train schedules, and uncovered the fate of colonial architecture in Algiers. His work has appeared in Architectural Record, Architect Magazine, The Atlantic, CityLab, Cultural Geographies, The Guardian, Pacific Standard, Urban Omnibus, the Wall Street Journal and elsewhere.