He graduated from the department of
architecture () at the
Warsaw University of Technology, where he studied during 1917-1925, as well as at the
École nationale supérieure des Beaux-Arts in
Paris, where he also studied
painting. During his studies in
Warsaw he belonged to the academic society
Welecja (). As a
graphic artist he worked for such periodicals as
Pro arte et studio,
Skamander and
Życie Literackie. He designed
print advertisements for pre-
WWII notable companies such as
E.Wedel (
chocolatier),
Orbis Hotels (then a tourist agency) and Herse stores. He is the creator of the still-used logo of
LOT Polish Airlines, winning a design contest in 1929. Gronowski took part in preparing the multi-color scheme () on the tenements lining the
Warsaw Old Town Square, and also worked in the city's
theatres as a
set designer. He was a member of the "Rhythm" Polish Artists' Association (). His work was part of the
painting event in the
art competition at the
1932 Summer Olympics. In 1933 he was one of the co-founders of the Commercial Graphic Artists' Circle (). Working at the same time within the Polish Union of Graphic Artists (), he co-edited the organization's serial
Grafika. He spent many of the years between the world wars in Paris, working as
interior designer in charge of decor for prestigious and exclusive shops, including
Galeries Lafayette. ==Awards==