Thomas

So, Thomas is Alice's husband and Jenna's father. Also, he's in a catatonic state and his history is awful and full of doubt. To review the facts we've learned about him, here's a post. We learned a lot from the cop's point of view chapter. He was fighting with Alice a lot before the elephant stampede. He had depression, severe enough that he was on three different medications. He did not trust Alice AT ALL, shown by his thinking that he would steal his notes and prevent him from getting a major breakthrough  in the elephant field because it would discredit his research. So that's one screwed up relationship in the book. But, he was worried about Jenna's well-being, so he's not a bad person, he just doesn't trust Alice, which could speak to either of their credibility and personality. Then again, he mentioned stolen research again in the asylum, so he may just be paranoid.
More importantly, he thought he was close to finding a cure to PTSD using elephants in his research, which is INCREDIBLE and must be a hint at something. His psychological state is awful, and may point to psych issues in Jenna's later life, or may even discredit everything he says. Thomas has a very obvious psychological break a little later, where he chains up elephants and talks about getting "U0126" into their systems. Ah! I really don't know what's up with him, but his catatonic state is really interesting. He most likely has PTSD, given the catatonic state and the research, but he could have had something to do with Alice's disapearance.
So. With all that, and the slapping thing (I read a little farther) I think he has a disorder, somewhere between borderline and paranoid. He is paranoid, has mood swings, violent impulses, depression, amnesia, which can be caused by BPD and stress, and relationship issues.
What do you think?