Not much is known about Pop's life before the outbreak, mainly due to the fact he can't actually remember, or he just doesn't care.
No one even knows his real name, and some think even he doesn't.
A group of survivors just found him napping during the riots outside his Nursing home. It took him a few weeks to realise he was killing zombies and not just Nurse's trying to take him back to the nursing home.
He was originally from Eastern Europe, but that's as far as it is known. He has lived in Chernarus in the Chernogorsk Nursing him for the last 15 years, which he has escaped numerous times. He has a serial hate for nurses.
He is known to not really care much about anything, or what he says to anyone. From what he figures, "he'll die soon anyway". While he is a liability, the group has grown to really feel the need to protect Pop, and keep him alive for as long as the stubborn man won't die. He seems to have a terrible memory, whether this is an on set of Alzheimer's or just being forgetful isn't known to the group.
Pop's has mentioned several times about serving in the war, but when asked about it further he just ignores the questions.
He does however have a love for sardines, mainly due to the fact that his taste buds have disappeared and he can't taste anything.