It proposes that interpersonal acceptance and rejection consistently predict the psychological and behavioral adjustment of children and adults across all ethnicities, languages, genders, cultures, and other socio-demographic groups of the world.

Over the course of time, he authored, co-authored, and edited 18 books and special issue of journals, and he published more than 200 articles, chapters, and other publications and electronic media.

In pursuit of his research endeavors, he received numerous grants from National Science Foundation, NIMH, the Smithsonian Institution, the American Philosophical Society, and other agencies.

In the course of developing his research, he lived and worked in many nations, including India, the West Indies, Turkey, Morocco, several parts of Europe, and among the Kwikwasut’inuxw and Haxwa’mis people (historically known as the Kwakiutl Indians) in British Columbia, Canada.

[14][15][16][17][18] Emerging evidence about the neurobiological and biochemical risks posed for the development, structure, and function of the human brain are beginning to help explain why these postulates and predictions are so consistently confirmed panculturally.

IPARTheory and associated measures have roots in almost six decades of research with more than 200,000 children, adolescents, and adults in over 60 nations worldwide, and with members of every major American ethnic group.

[25] Throughout his distinguished career, Rohner has helped shape the future of interpersonal acceptance-rejection by fostering multiple generations of talented trainees and faculty through mentoring, to enable them to attain their full potential.

His role as a mentor is as a didactic instructor, a passionate researcher, a seeker of talent and truth, an upholder of impeccable standards, a tough task maker when necessary, a compassionate listener, a dedicated and patient teacher, and a friend.

[27][28][29][30] IPARTheory stresses the following three foundational postulates: (1) Individuals have a biologically based need for positive response (e.g., for emotional support, care, comfort, love—i.e., acceptance) from the people important to them.

(3) When individuals feel that those people who are so important in their lives do not care about them (i.e., reject them), they are biologically predisposed to respond emotionally and behaviorally in at least ten ways.