Learning Objectives In this section you will learn about the major nursing theorists and the role they played in the development of psychiatric-mental health nursing Dr. Hildegarde Peplau: Theory of Interpersonal Relations Hildegard Peplau (1909–1999) was influenced by Sullivan’s interpersonal theory (next Chapter) and extended it to nursing practice, thereby developing the first systematic theoretical … Continue reading 2.1 Nursing Theories for Mental Health Nursing