Career
He was one of leading personalities in local "Towarzystwa Przyjaciół Książki" (Friends Book Society) in Kalisz. Zdzienicki, which developed a logo of a “Friends Book Society” in Kalisz. Zdzienicki was a President – from the day of initiation in October 1927 to 1936, when the activities of the society slowed down after deaths of several active members (Felicji Łączkowskiej, Alfonsa Parczewskiego, Mieczysława Krauckiego).
In professional life Zdzienicki was a prominent lawyer in Warsaw than in Kalisz.
He was on the Board of Directors of the society public library “Adam Mickiewicz” in Kalisz. In June 1939 he was elected to City Council as the candidate of the National-Catholic party.
Mieczysław Zdzienicki developed Registry of noble families in Grójec County (Kalisz, 1937). After the outbreak of World World War II he carried out genealogical research and worked on a book relating to st.Wojciech (which he did not complete).
