Biographies are presented of physicians Per-Ingvar Brånemark and David Lawrence Sackett. Brånemark was born on 3 May 1929 in Gothenburg, Sweden, who after studying medicine at the University of Lund, investigated the phenomenon of blood flow in bone fracture healing. Lawrence Sackett was born on November 17, 1934 in Chicago, Illinois, who gained his medical degree at the University of Illinois.