I'm a 35-year-old happily married Australian woman with 2 gorgeous children who ended up in a hospital psyche ward after completing the third day of the Landmark Forum. I have a similar story to the one you have published "Landmark Education destroyed my life--from the Forum to a psyche ward."
I too ended up signing up for the "Advanced Course" and the next day ended up in the hospital. I was on medication for a week and am seeking counseling. I'm fortunate that the medication has given me an amnesia effect and most of the course is a blur--except remembering that it was hellish, stressful and similar to emotional blackmail. All your power is taken from you and they had us conforming to their orders!
Note: See also Abstracts of Articles in Psychological Journals