The mayor of New York City may appoint several deputy mayors to help oversee major offices within the executive branch of the city government. The powers and duties, and even the number of deputy mayors, are not defined by the City Charter.
The post was created by Fiorello La Guardia (who appointed Grover Whalen as deputy mayor) to handle ceremonial events that the mayor was too busy to attend. Since then, deputy mayors have been appointed with their areas of responsibility defined by the appointing mayor. There are currently nine deputy mayors, all of whom report directly to the mayor. The majority of agency commissioners and department heads report to one of the deputy mayors, giving the role a great deal of power within a mayoral administration.
Deputy mayors do not have any right to succeed to the mayoralty in the case of vacancy or incapacity of the mayor.