With the help of Isaac’s descendants, we are in the process of assembling information about his life. It appears that Isaac had degrees in both engineering and medicine, that he practiced medicine and may have had more than one specialty, and that he was one of the few doctors to provide medical services to the population of Leningrad (St. Petersburg) during the two-year Nazi siege of the city, and the mass starvation, disease and death that accompanied it. We believe that Isaac was also deeply involved in the development of X-ray technology in the USSR, after the end of World War II.