Tens of thousands of intellectuals - refugees, displaced people, voluntary immigrants and emissaries - have left their homeland in modern times and moved to other countries in Europe and overseas. In a world-wide panorama, Peter Burke describes the important figures in the great waves of immigration since the fifteenth century: starting with the Greeks who came to Italy following the conquest of Byzantium by the Ottomans and ending with those fleeing from the Bolsheviks, the Fascists and the Nazis in the twentieth century. The migrations in the early modern period were mostly for religious reasons - for example, the Jews and Moriscos from the Iberian Peninsula, the Huguenots (French Calvinists) following the cancellation of the Edict of Nantes, and Catholics from Protestant countries. In the nineteenth and twentieth centuries, however, the migrations were mainly due to racial persecution and political and ideological reasons. Exiles and Expatriates in the History of Knowledge clarifies the difficulties of the scholars to integrate in the host countries and the choice between assimilation and seclusion in the expatriate community. But mainly he came to point out the enormous contribution of expatriates and immigrants to the creation of new knowledge and its dissemination, not only in immigration countries such as the United States and Israel, but in the entire world - from China in the East to Brazil in the West. Burke especially discusses the contribution of scholars in the humanities and social sciences: historians, researchers of the history of art and literature, philosophers, sociologists and anthropologists. Besides academics who managed to integrate into universities in the host countries, there were also other cultural mediators: printers and publishers, translators, merchants who settled for many years in distant lands, missionaries and scholars who were invited to the courts of rulers who sought to advance their country to modernity. The damage caused by the "brain drain" from the countries of origin eclipsed the gains produced by the world of knowledge as a whole: liberation from provincialism, bridging traditions, mutual fertilization. The detailed review in Peter Burke's book, which was written in 2015 as a warning against Brexit (Britain's exit from the European Union), is intended to convey a very important message even today: the reception of immigrants and refugees enriches the local and global culture and is the main antidote against the depletion of the spirit and narrow horizons.