Since 1921 he studied painting in Warsaw and had his first major exhibit the same year, while working for the Polish Foreign Affairs ministry. In 1925 had another major exhibition at Zachęta gallery in Warsaw, and upon seeing his spiritual work Armenian archbishop Józef Teodorowicz of Lwów asked him do paint the murals inside the restored Lwów's Armenian Cathedral; the work he finished in 1929, along with another Polish artist Józef Mehoffer who painted the ceilings there. After that major work, Jan Henryk continued with his religious art in Poland and abroad, amongst others he painted murals at the Kahlenberg's Chapel of Saint Joseph near Vienna, Austria, and at the request of Pius XI two murals at papal residence at Castel Gandolfo. During the 1930s Jan Henryk taught, as a professor of art, at the Lwów Politechnic University(Lviv Polytechnic). Jan Henryk came to United States in 1939 at the request of the Polish ambassador count Jerzy Potocki to paint murals at the Polish embassy in Washington showing king Jan III Sobieski at Vienna, and also some decorations for the Polish Pavilion at the World's Fair.