 After amassing a real estate fortune, having started with one thousand dollars, Kravinsky gave away virtually all of it to various charities, concentrating on public health organizations.Specifically, he donated almost all of the $45 million he amassed in real estate to charities dealing with improving health; he made the largest individual contribution ever to the foundation supporting the United States government Centers for Disease Control and Prevention (CDC), and also made major donations to The Johns Hopkins Bloomberg School of Public Health and to the Ohio State University College of Public Health.After Kravinsky learned that many African-Americans have difficulty obtaining kidneys from family members, he sought out a hospital in Philadelphia that would allow him to donate one of his kidneys to a lower-income black person.