This is the psychiatrist responsible for overseeing “patient zero” the “Russian John Doe” at the asylum.
Dr Adler stole the tril from the patient, to sell, but ended up losing it, and not knowing how it happened or where it went.
From that moment on patient zero began sending people back in time to the moment where the book was stolen from him, and Dr Adler would use this power to send people he considered “problems” back into the patient’s “memory” so they would disappear.
He himself was sent back once, but was able to escape.