Original: Moreover , the post of mayor in the three German city-states is equivalent to that of a Ministerpräsident ( head of government of one of Germany 's constitutive States ) and the respective post is referred to as Regierender Bürgermeister ( Governing Mayor ) in Berlin and Erster Bürgermeister ( First Mayor ) in Hamburg .
Simplified: These mayors are called Regierender Bürgermeister ( Governing Mayor ) in Berlin , and Erster Bürgermeister ( First Mayor ) in Hamburg .