The Mayor is the official head of a municipal government, although there are different mayoral systems, some where the Mayor acts as a strong executive, and others where he is weaker or even considered a first among equals with the city council. Pictured here are some nationally recognized current and former mayors, including Richard M. Daley (Chicago), Ron Kirk (Dallas), Rudolph Giuliani (New York City), Bill White (Houston), and Ray Nagin (New Orleans).