 A mayor is the sole chief of the executive branch of the municipality and he/she cannot serve in the municipal council (city council) or in the parliament.Mayors may appoint a deputy mayor if needed.In Poland mayor is called a "burmistrz" or, in towns with more than 100,000 inhabitants or other municipalities that traditionally use the title, "prezydent" ("president", for example, "President of Warsaw" instead of "Mayor of Warsaw").