Jonas Keller was born and raised in Germany where he tried to find his way into a medical career. After working as a paramedic for two years, he felt as if he needed to something that really matters to stop the suffering, so he decided to join the military in 2016. During his basic training in early 2017, Jonas accidentally broke his collarbone and rib as he fell down a small slope. As a result, he was retired and went to a reha clinic. In June 2017 he got back on his feet and started to help out in a local hospital.
As the incidents in Chernarus became public and the UN announced to send support, Jonas saw himself through his medical and military career as made for this mission, so he joined as volunteer.
He was assigned as a first responder in a medical camp for the UN peacekeepers. The wounded quickly made him aware of the extent of the situation. The camp got overrun in a night two weeks after he arrived. During the escape, he lost contact with his people in the forest and sprained his foot. As he wandered around in the darkness he found a forester's house with some supplies. He barricaded the door and provided his foot.
Another two weeks passed, waiting for the help of the UN troops. The supplies were running low and he lost hope of support, so he grabbed what was left and set off.