On December 6, 2013, the fourth subject began treatment in our ongoing Boulder, Colorado, study of MDMA-assisted psychotherapy for 17 subjects with chronic, treatment-resistant PTSD. This subject was enrolled on November 18, and the fifth subject was enrolled on November 20. Two subjects have now completed their one-month follow-up evaluations. Goals for this study include (1) gathering evidence for the safety and effectiveness of MDMA-assisted psychotherapy for subjects with PTSD from a variety of causes, (2) comparing different doses of MDMA for therapeutic effectiveness and ability to create a successful double-blind, (3) exploring whether using intern co-therapists can reduce costs while maintaining treatment effectiveness, and (4) training the next generation of psychedelic psychotherapists.