He is an assassin. He is wanted by "The Round Table". It's a secret organization of assassins, there are 12 elders, 1 from each part of the world. Under "The Round Table", there are assassins that are not as skilled as the elders, John Wick is one of them. He has the capability of outsmarting people that try to hurt and/or kill him. He misses his wife deeply, her name is Helen Wick, she has been killed by an assassin, that is why he became an assassin. He is extremely good at combat.