Hilary Koprowski is a Polish

Poland

Poland , officially the Republic of Poland , is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north...

 virologist and immunologist, and inventor of the world's first effective live polio vaccine.
Born to a family of Jewish background, Hilary Koprowski grew up in Warsaw where he attended the Liceum Ogólnokształcące and from age twelve took piano lessons at the Warsaw Conservatory. He received his medical degree

Doctor of Medicine

Doctor of Medicine is a doctoral degree for physicians. The degree is granted by medical schools...

 from the Faculty of Medicine at Warsaw University in 1939.