The proposed study is a randomized controlled trial of PT for persons with BPD and co-occurring AUD that will generate some initial data that can be used to determine the need and feasibility for further outcome studies. Participants are randomized to either a study group receiving weekly PT or to a control group receiving usual care. Enrollment is 15 participants in each group. The study group will receive 12-18 months of PT, with naturalistic follow-up. Outcome measures are administered by a research assistant at enrollment, 3 months, 6 months, 9 months, 12 months, and 30 months.