Welcome to the International Institute of Existential-Humanistic Psychology (IIEHP).  The institute’s main focus is on international training in existential and humanistic psychologies, with a focus on dialogue, integration and indigenous practices.

Who We Are

IIEHP was founded in July of 2011 by Mark Yank, PsyD, Louis Hoffman, PhD, Michael Moats, PsyD, Trent Claypool, PsyD and Jason Dias, PsyD. 


Director of IIEHP: Dr. Mark Yang is a California licensed clinical psychologist.  Dr. Yang received his Bachelor of Arts in Psychology from the University of California Santa Cruz and his Doctorate in Psychology from the Graduate School of Psychology at Fuller Theological Seminary in Pasadena, California.  Dr. Yang is actively involved in the training and supervision of psychology students from the existential-humanistic perspective throughout Asia.  Dr. Yang’s professional interests include:  humanistic and existential psychology, individual and group psychotherapy, grief and bereavement including end-of-life issues, legal and ethical issues in clinical practice, and cross-cultural psychology.

 Dr. Yang has lived in Taiwan, the United States, China and Hong Kong gaining personal experience as an immigrant and expatriate.  Dr. Yang also accumulated international business experience as an entrepreneur having operated a small assembly plant in China for six year.  Dr. Yang embraces the fact that he is a dog lover and laments the fact that he is unable to properly raise a dog here in Asia.


Assistant Director of IIEHP:Louis Hoffman, PhD

Louis Hoffman is an executive faculty member and director of the Existential, Humanistic, and Transpersonal Psychology Specialization at Saybrook University in San Francisco. He is a past-president of the Society of Humanistic Psychology (Division 32 of the American Psychological Association), current president of the Rocky Mountain Humanistic Counseling and Psychological Association, and author of eleven books, including Existential Psychology East-West. He serves on the Editorial Board of several journals, including The Humanistic Psychologist, the Journal of Humanistic PsychologyPsycCRITIQUES: APA Review of Books, and Janus Head. An avid writer, he has published numerous book chapters and journal articles on a range of topics including existential and humanistic therapy, international psychology, multicultural issues in psychology, poetry and therapy, and philosophical issues in psychology. He has been recognized as a Fellow of the American Psychological Association, which is given for “unusual and outstanding contributions or performance in the field of psychology.” He has also been appointed as Fellow with the Society for Humanistic Psychology, the Society for the Psychology of Aesthetics, Creativity, and the Arts, and APA Division 52 (International Psychology). As a licensed psychologist, Dr. Hoffman has many years of clinical experience providing therapy, supervision, and psychological assessments. Dr. Hoffman is active conducting trainings, giving conference presentations and lectures, and teaching courses in various countries around the world.

Director of Finance, Marketing and Public Relations: Trent Claypool, PsyD

Trent Claypool is an American Licensed Clinical Psychologist in the state of Colorado.   He works full-time as a Staff Psychologist at the University of Colorado at Colorado Springs where he provides psychotherapy, psychological testing, and clinical supervision and operates his own private practice.  He has served as the CE Chair for the Society for Humanistic Psychology, Division 32 of the American Psychological Association.  His clinical specialties include treatment of Eating Disorders, treatment of Traumatic Stress, and Evaluation of Learning Disorders.  He was born in Wyoming and currently resides in Colorado Springs, CO with his wife and daughter.


Director of Administration:  Jason Dias, PsyD

Jason Dias is a psychology professor residing in Colorado Springs, Colorado.  He has nearly twenty years experience working with adults with developmental disabilities, people experiencing severe states, and people experiencing both conditions at once, as well as with sex offenders.  He is a cofounder of the International Institute of Existential-Humanistic Psychology, whose mission is to provide basic counseling skills to students of psychotherapy in China.