Petrovsky served in the
Red Army as a military surgeon during the wars with Finland in 1939-40 and during
World War II with Germany. In 1945 he was appointed deputy director of the Research Institute for Experimental and Clinical Surgery where he extensively studied
oesophageal surgery. In 1948 Petrovsky was promoted to the title of professor of general surgery at the Moscow State Medical Institute. In the period between 1949 and 1951 he worked at
Budapest University as the chairman of hospital surgery and director of a surgery clinic. Then he was named chief surgeon at the
Kremlin Hospital in Moscow. Next he was appointed chairman of surgery at the
Moscow Medical Institute and in 1956 he was named the chairman of surgery at the Moscow State Medical Institute. In 1965 Petrovsky carried out the first
kidney transplant in the Soviet Union. In September of the same year he was appointed minister of health.{{cite news|title=Heart Surgeon Named Soviet Health Minister|work=
The New York Times Petrovsky was also a member of the
USSR Academy of Medical Sciences. ==Later years, personal life and death==