Derek Parfit played a crucial role in the XX century philosophical debate. His masterpiece, Reasons and Persons, has been highly influential both in moral philosophy, and personal identity. It is hard to overlook the fact that Parfit’s ideas gave the main contribution to the contemporary philosophy of persons. He reformulates a debate stuck in the classical contraposition between psychological and physical criteria of personal identity, by introducing his most famous idea: identity doesn’t matter in survival. This thesis, and its moral implications, has been a challenge for everyone tackling the issues related to persons and normative moral philosophy.