Robert Liston was an only child raised by his grandmother on his fathers side. Robert never met his parents and assume they are dead, and have been for a long time. Robert's grandmother was a nurse in a very rural part of the Appalachian mountains. Robert would often accompany his grandmother when she went to pay visits to the sick in remote parts of the country, and even assisted in the delivery of babies. Robert quickly grew accustomed to the sight of blood, pain, and death. He eventually started to develop a fascination with the function of the human body how to treat it, and even how to break it down. Robert's first hands on experience was when a neighbor got his leg mauled by heavy machinery, and his grandmother had to amputate the leg. When she began to amputate the leg she quickly ran into a problem. She wasn't strong enough to amputate the leg herself, and as a result 14 year old Robert was forced to conduct the procedure in order to save the mans life. Over the years Robert slowly learned from his grandmother, and other medically trained people he had encountered. When he turned 18 he started to his own medical practice out of his home. After a few years of this Robert was forced to put his medical practice to the side when the authorities started to hear about the unlicensed medical practices happening in the area. Robert's fascination with his practice was to overwhelming for him to stop now. Robert scraped his saving together and started traveling. He started with third world countries where he could get away with not having orthodox schooling and methods. Robert enjoyed his work in these countries but was not paid enough for his trouble, and was unhappy with his own living conditions. Robert then had an idea, he would travel to areas stricken by war and charge soldiers who would pay anything to have their lives saved. While doing this Robert quickly gained the nickname "the knife" for the fast speed he was able to amputate the limbs of wounded soldiers. Happy with his current occupational strategy he one day sought work in a country known as Chernarus. Robert thought this country would be perfect for him due to its very rural country, poor infrastructure, and bloody civil war.
After the outbreak Robert would offer his services to whoever would keep him alive whether it was a trader with food, or a gang of blood thirsty bandits with a wounded man. Robert managed to bounce around the country keeping his head down and miraculously stayed alive. His life was miserable, and would often contemplate suicide with his solace being his work. The hot sticky blood, screams of pain, and the lifeless twitches of his failed operations filled him with adrenaline, it was thrilling. Robert didn't care whether he saved a victim or not he simply liked to play with the life of his patients feeling no remorse, and working without a conscience. After a year Robert met an odd group in a forest near an odd stone obelisk and was never seen again....until now.