 This piqued Kim's interest in the history of his ancestors, and in 1987, he returned to Kazakh National University as a doctoral candidate, writing his thesis on the topic of "Socio-Cultural Development of Koreans in Kazakhstan in 1946-1966"; after graduation up until today, he has continued his work in the field of Koryo-saram and Korean diasporas studies.German Kim has written and edited a large number of books and papers published internationally.Of those three volumes of the History of Korean Immigration are particularly noteworthy on the history of the Korean Diaspora.