"Dr." for 'doctor' is the continental titulatur for finishing and successfully defending your doctoral thesis, thus attaining your doctorate. PhD is one of the

"Dr." for 'doctor' is the continental titulatur for finishing and successfully defending your doctoral thesis, thus attaining your doctorate. PhD is one of the US-variants of a doctorate. Reading 'doctor' and thinking 'MD' for 'Doctor of Medicine' is a mistake, although understandable when talking about medical issues. From Wikipedia I understand that f.e. in Canada MD is an undergraduate titel.