William Sand studied Medicine at the University of Athens, Greece. Son of rich people, by the time he finished his degree he wanted to live abroad for some time.For this reason he applied for a position for the Chernarrusian government, and they gave him a job at the hospital of Berezino, which he started in January 2017. This was not a full doctor position yet. Rather, he was still being trained, and assisted the medics.
William was regretting his decision to work in Chernaurus already after a few months. This was a very poor country, with many social conflicts and a very rural economy. For him, Berezino was just a tiny town full of farmers and some miners, and there was nothing to do for educated people like him. He missed Athens, but he did not want to stop a job that he had just started (his first job) so he decided to continue, and, at least, he would learn Chernarrusian before going back home. By the beginning of July the news were informing of much social turmoil, as the tension with Russia escalated. Also, he was informed that some soldiers had been infected of a rabies-like virus, but he did not pay so much attention for, at this stage, he was more worried about being caught in the middle of a war between Chernaurus and Russia. For this reason he decided to fly back home, and he booked a flight that would take him to Athens in mid-July. During this period, he learned that the virus was not rabies, but something new and extremely dangerous: he realised that the main problem was not Russia, but this new disease that converted people in monsters.
In the end, William was one of the many passengers that were trapped at the airport, the plane never took off. The hotel where he used to stay by the airport was now completely empty, but he spent the night there nevertheless. He found some food in the kitchen, and, like this, he started surviving in the apocalypsis. Now he tries to get information about what is happening abroad, and he wants to escape Chernaurus.
FINAL EDIT: He was killed in Kabanino by Eddie Malone and members of District.