Inclusion Criteria:  Current diagnosis of PTSD from medical record or CAPS-5 interview A symptom severity score≥33 on the CAPS-5 indicating clinically significant PTSD symptoms Three or more months since trauma Agreement to not receive other psychotherapy or meditation for PTSD during the active treatment or follow-up period. Psychotherapy for other problems will be allowed. If being treated with psychoactive medications, a stable regimen (no change in drugs or dose) for at least 2 months before enrollment Age: 18 years or older Language: English literate  Exclusion Criteria:  Prior training with TM or treatment with PCT in the past year Currently untreated psychotic symptoms or mania symptoms from chart review or self-report Moderate or greater cognitive impairment indicated by chart diagnosis or observable cognitive difficulties Acute severe symptoms (such as imminent suicidal risk) that will likely require active treatment intervention (such as medication changes) within the course of the study Psychiatric hospitalization in the previous six months