After watching and loving this show, I had an epiphany. Who has Jane hurt in the past and carries a grudge. Who wants to test him, as he did in the past? At the same time, who cares enough about him not to just kill him? Who believes in his talents enough to push him and taunt him for the slights he feels Jane caused him? Who did Jane walk away from, setting this all in motion to `teach him a lesson' in who was smarter?
His father.
Red John is Jane's father.
Side Note: Has anyone noticed that the smiley Red John paints on the wall looks a lot like Jane when he smiles? Just a thought
