Jan Graff was born in 1885. In 1914 he graduated from the Faculty of Engineering of KPI. From 1919 in Poland he took part in the construction of the railway Vydzev - Zgierz and Zgierz - Lenchyka. Since 1922 was a head of the department of Directorate construction of state railways in Warsaw and built the railroad shops in the town Pruszkow. Since 1928 he directed the construction of railway lines Herby - Gdynia, and simultaneously from 1933 - Krakow - Miechów and Schakov - Bukovina, from 1935 - Sierpc - Torun and Sierpc - Brodnica. Before the war, he engaged in investments in the District Directorate of railway in Torun. After beginning of war Jan Graff turned back to Warsaw. In 1944, during the Warsaw Uprising he died along with his wife, avalanched with ruins of his home due to the bombing of Nazi aircraft. As rebels his son and daughter also died. Jan Graff is buried in Warsaw.