From 1957-1959 served as Head of the Department of Architecture and Urban Planning of the Board of Museums and Monuments Protection. Stanislaw Zaryn was the principal architect in charge of the design and construction of over 40 historical buildings. Among the most recognized works is Dekert city block of the Warsaw Old Town Square, housing the Archives and the Historical Museum of the City of Warsaw. His contribution included not only architectural projects, but also interior and exhibit designs (see Museum of Warsaw archives). With eng. Stanislaw Hempel, he design and supervised reconstruction of the Column of King Sigismund III Vasa - the monument destroyed in 1944 by Germans. In 1980 the Historic Centre of Warsaw was recognized by UNESCO as a World Heritage Site. Despite political difficulties during communist regime, he worked closely with Church organizations in the restoration and rebuilding of several religious heritage buildings including fragments and details of Warsaw Cathedral. As well, Zaryn was involved in several projects outside of Warsaw: Sandomierz Castle, churches in Bolimow, Lomza, Poznan Cathedral, historic townhouses in Jelenia Gora, Plock,  Brzeg. (For projects documentation see: Hanna Szwankowska "Zbiory Komisji Badan Dawnej Warszawy", Muzeum Historii Polski 1997). He authored numerous articles and books on the history of architecture, conservation and reconstruction focussing on build heritage. He participated in many public lectures and radio interviews actively promoting conservation of Polish build heritage. During this period He also taught at the P.W. Faculty of Architecture with prof. Jan Zachwatowicz of Polish Architecture Chair and prof. Piotr Bieganski. From 1945 he was a lecturer and then Adjunct Professor till his death in 1964. In his teaching, Stanislaw Zaryn passed on to the next generation of architects, his extensive knowledge in the field of postwar reconstruction.