Then in 1901 he was appointed as an extraordinary professor of statistics at the University of Berlin. Bortkiewicz became an ordinary professor of statistics and political economy at the University of Berlin in 1920 and he spent the rest of his life there.
Pagkatapos ay sa 1901 siya ay hinirang bilang isang katangi-tangi propesor ng mga istatistika sa Unibersidad ng Berlin. Bortkiewicz ay naging isang karaniwang propesor ng statistics at ekonomyang pampulitika sa Unibersidad ng Berlin sa 1920 at siya na ginugol ang magpahinga ng kanyang buhay doon.