He is 1st indirectly pointed out by Booth during Season 1's "The Soldier on the Grave" when Booth tells Brennan about killing Radik and his remorse about carrying out it in entrance of Radik's son, at the boy's birthday occasion. HOW HE HAS SURROUNDED HIMSELF WITH Worse THAN SLAVES MINIONS WHO GIVE HIM Endless Ego Massage AND TELLS HIM ONLY WHAT HE LIKES TO Hear..