Up until about 30 seconds ago I didn't think that RJ was anyone on the list.......Walter Mashburn was my guess...however....I've just watched a clip that replays the scene out of s6 e2 where Reed, Bertram and McAllister are in Bertram's office and Reed says 'exactly how much does Jane know' to which Bertram replies 'well that is the question isn't it'......Bertram sounds very very similar to Red Johns voice.....have a listen and let me know what you think!!

I don't know what to think now as before this there is no way I'd have thought it was him!