The data isn't conclusive enough to lead us to one suspect and rule out the others. This is a fact we have to admit before we do any further analysis. The theories I've read so far here and elsewhere are mostly wishful thinking. Currently the question "who is Red John?" can not have a strictly rational answer. So the appropriate question to me is more like "who can we expect to be Red John?". Despite the data being inconclusive, we can still take advantage of whatever we've seen so far in the show. Anything beyond that is mere speculation. Rosalind Harker's description of Roy(Red John) is a good start. Here it is:

Just under six feet tall,
Not muscular but not soft either,
Short straight hair,
A gentle voice,
Rough strong hands,

Two other facts we can rely on:
Red John's apparent connection to Visualize(The Red Barn).
And the fact that he's a charmer and can manipulate women pretty easily.

So lets apply these to the suspects,

Gale Bertram(Michael Gaston ): Height 6' 3"
Thomas McAllister(Xander Berkeley): Height 6'
Reede Smith(Drew Powell): He's good enough for "just under six feet tall".
Bret Stiles(Malcolm McDowell): Height 5' 8"
Bob Kirkland(Kevin Corrigan): Height 5' 9"
Bret Partridge(Jack Plotnick): Height 5' 11"
Ray Haffner(Reed Diamond): Height 6'


Bertram's height and baldness definitely rule him out.
McAllister is bald, so there is no hair to be short and straight! He's out too.

These two are definitely out. They fail to fit Harker's description no matter how you interpret it. To me Smith has a soft body an not a gentle voice. And It doesn't look like Stiles has short straight hair or rough strong hands. But then again some of you might find Smith's voice gentle, or Stiles hair short and straight. 

That leaves me with three suspects: Kirkland, Partridge, and Haffner. Kirkland is just too obvious, the limousine scence, the only handshake with Jane everyone could recall, pursuing Lorelei, Killing a witness, breaking into Jane's room, and being creepy and Red John'ish in general. I just can't buy it. Partridge has been a suspect since the very beginning of the show, he fits Harker's profile but not the two facts I presented. Haffner looks like a charmer, he's a Visualize member, he fits Harker's profile perfectly, and most people don't expect him to be Red John. He's my choice.

Gale Bertram, Raymond Haffner, Thomas McAllister: one of this three is red john probably Raymond


- Bret Stiles: is probably an old friend


- Reede Smith: i don't think he is connected to red john


- Bob Kirkland: i don't think he is red john but his right hand man


- Sheriff Thomas McAllister: i don't think that he related to RJ at
all, he only appeared in the first episode and wasn't that special(but
who knows, there is no evidence that he isn't RJ, but if he was it will
really be a bad decision from the writer)


- Brett Partridge: i don't think he is red john but maybe a one of his
minions, and Bruno Heller stats in an interview that red john isn't a
basement kind of serial killer(which Brett seems to be, as remarked by
Jane in S01E01) and he also doesn't seem to have the money red john
seems to have, he also isn't that high in the society or work as Red
John seems to be, and he doesn't have the "looks", because RJ isn't just
a serial killer he is a cult leader, so how he looks is important


- Gale Bertram: i just don't think he is red john, for a lot of tiny details that don't add up


- Raymond Haffner: He fits all the criteria so far, he is a high
ranking member of the CBI,a Visualize member, and after the evidence
from "The Red Barn" it seems possible he was at the farm in 1988 when
one of the first Red John smiley faces was drawn. He fits the age,
description, seems to have money, and mental intelligence, he is also
interested in Lisbon and tries to befriend her (if he was red john that
is probably what he would do), and most of all he is called ray, and
we know that red john nickname is Roy !!


- None of the above (His father, someone else): i don't think that he
is none of the above because if he wasn't i think he would probably
mocked Jane about it in the video at the end (also he said, that
because of what Lorelei said to Jane, the game rules is going to
change, so if what she said was wrong he wouldn't really bother), and
it isn't Jane's father because he was a fraud and didn't have a problem
with it, unlike red john who seems to be a man of honor in a way
(S01E01, the note he leave's to Jane about killing his family) but i
think that his father may be one of red john's minions.


And Bruno Heller said that RJ is in the list so that's impossible .




- JANE HIMSELF!!: that''s not possible for a thousand reason:


1- he isn't a Visualize member


2- he doesn't have the time(he was awake for a whole weak during the
finale episode, so he couldn't have killed RJ's last victim)


3- he can't possibly handshake himself


4- Lorelei wouldn't lie to him (about handshaking RJ) and in the same
time plan to kill his alter ego "RJ" for killing her sister


5- Bruno Heller said that RJ is in the list and Patrick Jane isn't.


6- 7- 8- 9- (i am just tired of writing)


- All of the seven names or more than one of them! : that's not
impossible per se, and it would actually make a great twist if RJ isn't a
single person but a group of people pretending to be one person, but
still i don't think that and don't want to think that this is what will
happen actually.


And about how RJ knew about Jane's "Happy Memory" that RJ stole the
finale episode, i think at some point red john hypnotized Jane(He was
alone with him for some time in one of the episodes) into telling him
god knows what, Or Jane's father Alex maybe one of RJ's minions or at
least his related to him somehow and he spoke with RJ about that "Happy
Moment" in Jane's life.


but what is really wired how did he know the list, there is a few explanation:


1- he is watching him all the time or making someone watch him and he deducted the 7 names from what he learned


2- the video is edited and is made/edited after Bob Kirkland(who is
related or is RJ) saw what Jane was working on in his secret hideout,
and deducted the names from what he gathered and edited the video that
he made of Lorelei and put the names in it


3- something else (But certainly Not PSYCHIC related)

This is rather random but i think we will find out that rigsby's baby is actually red johns because the women he was with seems very suspicious. Therefore, i believe she works fir red john and so that baby is not rigsby's.

Okay so before we begin to even take a stab at who red john is we have to get in the right mindset, have to ask ourselves these questions:
1. did bruno even tell the actor who is red john noone knows2. script changes (end of season strawberrys and cream was meant to be end of series maybe cus of bad ratings)3. has to be a well known good actor4. do we have enough info to be able to guess who it is? or are the major clues commming in the last season.explain the script changes with the killing of fake red john was meant as a series ender because of his voice and he seemed like a perfect match, plus since they didnt know who red john was the actors themselves are in a different mind set so some clues that we think are clues might not be clues at all.. thats the irritating part about thisthe list of suspects are as follows:1. Reed Smith
2. Sherrif McAlister
3. Brett Stiles
4. Bertram
5. Haffner
6. Kirkland
7. forensic dude***AND NO JANE ISNT RED JOHN! (Bruno already stated that and varified the validity of the 7 list suspects that red john is one of them)---My THEORY--- Reed Smith is not gonna be him because even though his age might be close i think hes a little too young to be on the farm. He does seem like the red john personality but i believe hes just a distraction hes too hot headed to be red john, plus hes not that high up in the FBI to have real power so i believe he is out. Kirkland is another interesting one, because he broke into Janes office but he gave me the impression that he is trying to find Red John more than trying to conceal his identity, some people say he is also excluded because he appeared after when lorelei told jane he shook hands with red john, but either way he doesnt seem the red john type, even though he has a certain level of creepyness. My theory on kirkland is that he was a victem of red john, the way lorelei sister was, kirkland was also a adopted kid that was in that program where loreleis sister was (miranda), but managed to escape somehow (or someone saved him), so thats why he asks that guy (i think his name was todd johnson) something like do you know who i am? That would be so stupid if red john did ask that because obviously todd worked for red john and he knew who he was... Forensic dude (forgot his name lol) could very well be a potential red john suspect because he was there from the biginning, plus he worked on all the red john cases, maybe red john likes to come back and see the reactions on what hes done, but if i had a choice i would say hes not because (and if only my theory stands true that there were script changes) he was meant to be the scapegoat to make people wonder or just kept around in the story in case the script changed, kind of as a "back-up Red John". Brett stiles is an interesting one, i could very well see him being red john (if not for the age confliction) because he is very powerfull man by running visualize, has alot of people (like haffner) in various governmental positions. But i get the feeling that he is more of a good guy than bad, but he has some kind of relationship with red john, hes not red johns diciple but he knows him somehow (like how he knew where frye was being held and told Jane). Also his relationship with jane  seems genuine why would he risk breaking out lorelei out of prison if he was red john, red john would never do that. Sherrif McAlister is another name people werent that happy to see, why??? I could definetly see why bruno chose to put him in, that actor is wonderful he plays the main antagonist in Nikita, not to mention being in alot of blockbuster movies, the bottom line is the man could act and we have to assume that red john (in order for it to be worth 6 seasons of chasing) has to be played by a good actor, that is the reason why i think he could be red john, even though he was only in one episode. Also, on the side note, in episode 2 (only one he appeard in) when they were questioning that dead girls boyfriend, the mexican thug, he kept looking at the side of the camera (at the fherrif) before he answered the questions, just something that jumped out at me i doubt it means anything, just had to say something we dont know shit about him.,  Bertram, wow between the william blake quotes and those creepy eyes, not to mention the large amount of power he has in SBI being the director, he really could be red john, i dont know what to say about him but i feel like in the finale strawberrys and cream where jane creates that hotel room trick to find out the informant, it was funny to me that bertram was thought to be it (later cleared because the killer wanted to propel to the floor underneath on the balcony), i just thought that was funny but anyways could very well be red john. Also i was always wondering in strawberrys and cream episode how did the fake red john know where bertram and jane were going to wait for hightower since only those 2 knew maybe i missed something but it might point to bertram again..
 
 Haffner is my ideal choice in red john for a few reasons, he is the perfect age to be on the farm and be red john, plus he is a member of visualize, lisbon asked him if he was at the farm and he said "were still friends right?", he asks cho if jane is smarter than him (red john like mentality), he tries to convert lisbon like he does with other of his disciples by giving them something they want, in lisbons case it was the job offer (very red john like action), he has a good deal of power in his career, plus i always was thinkind about what the stiles -red john link is, i believe that since haffner is a part of visualize he uses the religions resources and contacts (thats why he has people everywhere), but i always asked myself why would stiles let him? My answer would be that they are related somehow, we can assume that since we dont know shit about stiles (he doesnt owna  house, car nothing everything is in visualize) he can create a identity pretty easily (or hide one), plus haffner and stiles look kind of alike, same hair color, eye color, my guess is he is either his son or some part of his family, so thats why he knows so much about red john yet he doesnt seem to be under his control...Those are just random theories of mine but hey maybe we dont have enough clues at all, if its mcalister in the end you can see my point, all we can do is wait for next season! Also, on a side note WTF happened to janes dad??? why dont they mention his story i bet you hes gonna play a bigger part of next season i doubt hes red john but he has to know red john otherwise how can red john know that happy memory jane had about that girl in his home town, I doooont knooooow! xD

Red John can't be Gale Bertram because he is bald and according to Rosalind Harker's definition, she said Roy has short straight hair. Can't be Bob Kirland because it does not make any sense, why would he broke into jane's work place and steal information (about who red john is) if he is Red John himself? besides he did it after Lorelei died. I think Bret Stiles is kind of old so is sheriff Mcallister (at least on my opinion, i think Rosalind Harker would've said  if red john was that old). this left us 3 suspects, and i think Reede Smith and Brett Partridge are too young, so in my opinion Ray Haffner is Red John, he is in visualized and he was involved in the Red Barn Case...

I was wondering if there is something wrong with the list?
Of course it was confirmed by Bruno Heller. What what puzzles me is the fact that Jane smiles when he recognized someone break into his attik where he 'lives' at the CBI when he places the toothpick as a secret mark in the door crack. It seems that he awaited it somehow to set somebody on the wrong track?

Then again I think Bratt Partridge is to young the be RJ. Remember back the days when RJ worked on the Elliston farm during the time in 1988 when he was a member of the sect. So he must be older maybe around the Age of Ray Haffner.
Because they say that RJ is someone maybe the same age the farm workes have been.
Also Bret Stiles knows who RJ is. Because he doesn't give the list of the farm workes from Elliston farm during that time.

I just found out the the name of the actor who plays Ray Haffner is ( Reed Diamond ) !!!!!!!