Brookings Institution’s inestimable urban planning guy Christopher Leinberger will be chatting through the Greater Greater Washington Web site at 1 p.m. today.

Leinberger is one of the shrewdest of the “New Urbanism” school, whose scholars argue that the days of the sprawling, cul-de-sac suburbs are gone and the future is in the walkable high-rises (think White Flint).