This paper suggests the use of cultural expertise as encompassing concept that can account for the natural cultural competence developed in Iran. In earlier times, Zoroastrian law was first based on religious norms and the primary theological division between sins and offenses. Iranians had to adapt to different legal systems: customary law, religious law and secular law. Priests, jurists, judges, officials and translators were the main cultural “experts” and mediators between the people and the normative institutions. The introduction of imami legal theories and jurisprudence in the 16th century together with the reinforcement of the secular political power engaged Iran in a stabilized judicial context ruled by shiʿi scholars, qāzis and mujtahids. In 1919, as a consequence of the new French inspired Constitution, the Ministry of Justice, in order to train a new generation of judges, magistrates and justice personnel, set up a law school. Professors, who can be considered as cultural experts, contributed to the acculturation process initiated in the judicial system. Examples of his continuous struggle are recounted in Ostad Elahi's (1895-1974) memoirs, relating the difficulty Iranians had to accept the change, both cultural and psychological, initiated by the modernization and westernization program put into operation (1911-1935).