HPRT’s clinical model has evolved slowly over the past two decades. In December 1981, HPRT began as a pro bono effort by a doctor, social worker and three Indochinese refugees from Laos (Hmong), Cambodia, and Vietnam. This clinical group began to treat Southeast Asian patients in a primary health care clinic for one four-hour session per week. Almost nothing was known at this time about the trauma suffered by these patients or their cultural worldview of emotional suffering. Two decades later, HPRT provided mental health treatment for over 8,000 refugee patients and civilian survivors of mass violence and torture, and its clinical approach has been applied in culturally diverse settings throughout the world. HPRT’s model continues to evolve as new clinical insights and therapeutic approaches emerge.