after studies in germany, puzinas returned to kaunas. he became director of , where he briefly worked as a student. he inherited a museum that more closely resembled a storage space of old artifacts than a modern museum. he also became an assistant professor at the faculty of humanities of vytautas magnus university. among his students were marija gimbutas, , . he was one of the few professors at the faculty who received proper education in their field of study. he lectured on 20 topics, including broad topics, such as indo-europeans, vikings, prehistory of europe. lectures were often accompanied by field trips to museum or historical sites, even experiments (for example, recreating control of fire by early humans). when vytautas the great war museum was opened in 1936, puzinas developed its prehistory exhibition based on the modern museum practices. the exhibition was officially opened in january 1938 by president antanas smetona. for this accomplishment, puzinas was awarded the order of vytautas the great. he participated in 27 archaeological excavations, mostly burials, but showed no great enthusiasm for field work, often supervising the excavations only on paper. he organized obtained data and exhibits, visited museums abroad, attended international archaeological conventions, published articles on prehistory and archaeology in lithuanian press and "lietuviškoji enciklopedija", the first encyclopaedia in lithuanian. he also made presentations to schoolchildren to popularize the field. between 1935 and 1944 he published about 150 articles and other publications.