David Wiss, PhD, RDN, IFMCP
Dr. David Wiss, PhD, RDN, IFMCP, is a mental health scientist, registered dietitian nutritionist, and Institute of Functional Medicine Certified Practitioner. He specializes in biopsychosocial approaches to mental health treatment, with particular emphasis on the integration of nutrition, lifestyle medicine, and emerging therapeutic modalities. With over 13 years of clinical experience, Dr. Wiss has pioneered innovative approaches to substance use disorder and eating disorder treatment that address root-cause mechanisms often overlooked by conventional treatment models. His work has been featured in National Geographic, The New York Times, and The Washington Post. He has authored over 20 peer-reviewed publications and serves as a thought leader on the complex relationships between trauma, neuropsychology, and recovery.
His approach to this emerging field of psychedelic-assisted therapy is characterized by scientific rigor, clinical humility, and dialectical thinking—holding both the genuine therapeutic promise and the legitimate risks in the same space. He brings both skepticism and openness, having evolved from initial caution to thoughtful integration based on emerging evidence and from witnessing miracles. Dr. Wiss’s clinical philosophy emphasizes patient autonomy and the primacy of the therapeutic relationship. Currently, his ongoing work with clinicians across mental health, addiction medicine, and trauma treatment focuses on holding challenging ideas and conversations with nuance. His long-held passion is blending ancient wisdom with modern science.