Our first study volume tried to explore the work of several prominent Transylvanian personalities, and new ones are now joining them: Balázs Orbán, Károly Kós, Zsigmond Szentkirályi, Elemér Jakabffy, Elemér Gyárfás, Ferenc Pethe, Dénes Kislégi Nagy, Béla Kovrig, György József Oberdig, Miklós Nagy, István Imreh . The publication of this study volume is all the more important, since our scientific history, which has been in the minority for almost a century, has not had enough to analyze the valuable activities of these outstanding specialists and introduce them to present and future generations.