Daniel would be raised in Seattle, Washington. Mainly in downtown where the traffic is almost as deadly as the daily dead he has to deal with now. Having been the youngest sibling of his two other siblings, he had the most pressure by his parents to succeed and take care of them. He showed a great interest in physics and astronomy, the idea of there being other earths very interesting.
In his free time he spent it playing games, doing homework or practicing self defense at the local gun store, mainly being a Colt 1911 his father got him as a 'present', though he always figured his father just didn't remember to buy a present in time as it was well worn and stained by sweat. During his college years he was not exceedingly social, mostly because most people were also not social.
Now how did he end up here? His professor decided that the best idea was to take the class on a payed expense trip to Chernarus to study the stars, see nature and probably save more money then going somewhere sane a safe like Hawaii, a place with a dozen observation posts and the largest astronomic college. During the trip home some students began to grow sick, coughing and vomiting, some even falling unconscious as they waited for their ride at the airport to arrive. The professor turned first, with many others. Daniel did the one thing that his body naturally selected from the flight or fight response, which was flight. He ran and ran, zombies at his heels but adrenaline keeping him going.
He'd eventually stop, panting and lost in the woods from the encounter, having torn his clothes and gotten nicks from branches of trees. The zombies would be unheard, having lost him in his mad dash, and now he learns to survive with no idea how to even load a rifle, sharpen a knife or even pitch a tent. Life is life.