The American Dr. William Stewart Halsted (1852–1922) was one of the greatest pioneers of modern surgery. He developed operations for breast cancer, hernia, aneurysms and various other conditions and diseases.
In addition he was very strict on sterilized surgery environments and discovered that blood could be re-infused into a patient. Not everything was perfect in his life though. His experimentation and discoveries in the field of anesthesia, led him down a terrible path. He was addicted to cocaine and later even morphine.
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Photo Credits / Sources:
By John H. Stocksdale (http://ihm.nlm.nih.gov/images/B14034) [Public domain], via Wikimedia Commons