Ion Cantacuzino was a prominent Romanian scientist and physician, born on January 25, 1863. He is best known for his contributions to immunology and microbiology. Cantacuzino played a significant role in the development of vaccines, particularly against diseases like tuberculosis and diphtheria. His work laid the foundation for modern vaccination practices in Romania. In addition to his research, Cantacuzino was a dedicated educator and served as the director of the Cantacuzino National Institute of Medico-Military Research. He was instrumental in advancing public health initiatives in Romania and is remembered for his commitment to improving healthcare and scientific research in the country.