Dr. Shlomo (Solly) Angel leads the NYU Urban Expansion Program. The primary mission of the Program is to lend assistance to the municipalities of rapidly growing cities in making room for their inevitable expansion, making realistic projections of the future land needs as well as minimum necessary preparations for accommodating the growth of their populations in an orderly and sustainable manner, ensuring that land remains plentiful and affordable. The secondary mission of the NYU Urban Expansion Program is to gain a better understanding of urban expansion the world over by monitoring it in the entire universe of the 4,250 cities nd metropolitan areas that had 100,000 people or more in 2010, and by collecting and analyzing evidence on the quantity of land required for urban expansion, on its physical organization and its affordability, and on the forces affecting it in a stratified global sample of 200 of these cities.