During his career he published several books and designed hundreds of coats of arms, flags, banners and seals for over 200 different municipalities and institutions.
He worked closely with the foremost German heraldist, Ottfried Neubecker, and the American vexillologist Whitney Smith.
Znamierowski produced thousands of renditions of coats of arms and flags for their books as well as for numerous encyclopedias in Germany, United States, and Poland.
Znamierowski wrote several books on vexillology and heraldry and designed arms and flags for many Polish administrative districts, cities, and communes.
Although he was known mainly for his expertise in heraldry and vexillology, he was also a leading member of the Polish-American Socio-Political Movement, POMOST, and of Solidarność Walcząca from 1981 to 1990.