Rolf_Maximilian_Sievert--Wilhelm_Roentgen

Rolf Maximilian Sievert (Swedish: [ˈrɔlf maksɪˈmǐːlɪan ˈsǐːvɛʈ]; 6 May 1896 – 3 October 1966) was a Swedish medical physicist whose major contribution was in the study of the biological effects of ionizing radiation.
The sievert (Sv), the SI unit representing the stochastic health risk of ionizing radiation, is named for him. He has been called the "Father of Radiation Protection".