Joe Muller has been a lumberjack in the old days, until he wanted to help the nature and started taking pictures to spread the beauty of the world, the flora and fauna, which is why he wanted to visit Chernarus with his girlfriend and family friends in June 2017. Since they didn't know about the situation there, they planned to go to the northeastern parts of Chernarus, but on their way there they met a group of people, saying that it wasn't completely safe and they'd suggest to stay in the western parts. They planned to take pictures of the landscape, since they heard it should be a fantastic view, a land where nature still has power and delivers a sence of peace. It was a great time, until the day they realised the rumors and one of his friends wanted to leave the place, back to Germany. They fought and the group split up. When they left, Joe knew that he might never see them again, since he's heard of people not being able to travel freely. He was afraid and started looking for them, with his wife being at his side. The outbreak surprised them obviously, but with the knowledge from movies and games, Joe managed to survive. He still annoys people by telling them of great stories from postapocalyptic movies and how they helped him surviving the whole situation. Now, as he got a little bit mad over the time, he tries to take pictures of the walking dead, kind of seeing them as the new power of nature.
After spending a lot of time with 2 people he met, Maddy and Leonidaz, he got used to the life in a community and started building a home with them. One day though, while Leonidaz went looking for supplies, Maddy and Joe got robbed by a mad guy in their home and Maddy died. He was horribly wounded but managed to survive and escape. He's never seen Leonidaz since then and tries to survive on his own now, living in the woods and only going to cities to gather supplies. Luckily he found a girlfriend for himself, making it easier to forget the hard times and starting a new life.