Henry E. Handerson was a notable figure in the field of medical history, particularly recognized for his scholarly work on medieval medicine. His most significant contribution, 'Gilbertus Anglicus: Medicine of the Thirteenth Century,' delves into the medical practices and theories of the 13th-century English physician Gilbertus Anglicus. This work not only sheds light on the historical context of medical knowledge during the medieval period but also illustrates the evolution of medical thought leading into the Renaissance. Handerson's exploration of Gilbertus Anglicus's writings provides valuable insights into the intersection of science, philosophy, and religion in medieval medicine. By analyzing the texts and their implications, Handerson contributed to a greater understanding of how medical practitioners of the time approached health and illness, as well as their reliance on both empirical observation and traditional beliefs. His scholarship remains significant for historians and medical professionals interested in the roots of modern medicine and the historical development of medical practices.