Heo Jun was a prominent Korean physician during the late 16th century, known for his contributions to traditional Korean medicine. He is best recognized for writing the medical text titled Dongui Bogam, which translates to "Mirror of Eastern Medicine." This work compiled various medical knowledge and practices of the time, making it a significant reference for practitioners of traditional medicine in Korea. Heo Jun was born in 1539 and served as a royal physician in the Joseon Dynasty. His dedication to medicine and his efforts to improve healthcare in Korea have made him a celebrated figure in the history of Korean medicine. His legacy continues to influence modern practices and education in traditional medicine.