Tibor J. Greenwalt

Tibor Jack Greenwalt (January 23, 1914 – July 17, 2005) was an American hematologist who specialized in transfusion medicine. Greenwalt earned his medical degree from New York University Medical School in 1937 and completed a hematology fellowship under William Dameshek. After serving as a US Army physician in World War I, he settled in Milwaukee, Wisconsin, where he became a professor of medicine at the Marquette University School of Medicine. He was a founding member of the American Association of Blood Banks and served as president of the International Society of Blood Transfusion from 1966 to 1972.

In 1967, he moved to Washington, D.C., where he became the national director of the American Red Cross's blood program and taught at the George Washington University School of Medicine. After retiring from the Red Cross in 1979, he moved to Cincinnati, Ohio, where he became emeritus professor of internal medicine and pathology at the University of Cincinnati. In a scientific career spanning 60 years, he contributed to the understanding of hemolytic disease of the newborn, the genetics of human blood groups, and the storage of donor blood, among other topics. He was a fellow of the American Association for the Advancement of Science and a member of the National Academy of Medicine. Early life and education Greenwalt was born on January 23, 1914, in Budapest, Hungary.