He was a son of painter Stanisław Masłowski (1853–1926) and piano teacher Aniela born Ponikowska (1864–1940).
From 1931 to 1939 he worked in the Department of Fine Arts of the Ministry of Religious Affairs and Public Education (Polish abbr.
From 1939 to 1945 he was the artistic and scientific advisor to Society for the Protection of Folk Art in Warsaw.
[3] In the same year he was also commissioner of Polish Painting Retrospective Exhibition in Prague in Czechoslovakia.
Trying to survive, he undertook various commercial activities and cultivated research and literary work at home in Podkowa Leśna (where he lived permanently from 1945 until his death in 1976 in Wysokie Mazowieckie).