I think Red John is Robert Kirkland - you only see him twice in the show. He appears for the first time in Red Dawn. He is a friend of FBI's Californian chief Alexa Shultz. In If It Bleeds, It Leads, Bob Kirkland identifies himself to Agent Lisbon as a agent for Homeland Security and at the end of the episode he recognizes Jane even though he doesn't know him... 
Let's see on the next episodes but he looks very suspicious and creepy!