Zhang Zhongjing-Physician who wrote Shang Han Za Bing Lun

Zhang Zhongjing (张仲景) (150—219), formal name Zhang Ji (张机), was a Han Dynasty physician and one of the most eminent Chinese physicians during the later years of the Han Dynasty. He established medication principles and summed up the medicinal experience up until that time, thus making a great contribution to the development of traditional Chinese medicine.

His best known work is "Shang Han Za Bing Lun". Not only did it contain over 100 effective formulas (many of them still used today), but the text implied a theoretical framework that led to hundreds of books analyzing, explaining, and reforming it.