Allan Cormack was a South African physicist born on February 23, 1924. He is best known for his pioneering work in the field of computed tomography (CT), which revolutionized medical imaging. Cormack's research laid the foundation for the development of CT scanners, allowing doctors to see detailed cross-sectional images of the human body. In 1979, Cormack was awarded the Nobel Prize in Physiology or Medicine alongside Godfrey Hounsfield, who developed the first commercial CT scanner. Cormack's contributions to science and medicine have had a lasting impact, improving diagnostic capabilities and patient care worldwide. He passed away on May 7, 2022.