I am an American, but I honestly can't stand the country any longer and intend to emigrate. My question is simple enough: is the nationality of a postgraduate program relevant to later employment opportunities? Specifically, if I completed a Ph.D. in the States, would this limit my ability to be employed in Europe? I would appreciate any insight or references to information on the subject; I am having difficulty finding much information at all outside of the heads of my advisers.