sentences:  Once again in Warsaw, and unable to make a living with his art, he was able to obtain work at the Ministry of the Interior, where his old employer Mostowski was Minister.In 1820, after winning a gold medal for his painting of Saul and David, he was appointed an Interim Professor of Drawing and Painting at the University of Warsaw.He became a full Professor in 1824 and remained there until the University was closed by Russian authorities in 1830.