Dr. Louis Nieuwenhuizen (pronounced "Nye-wen-how-sen") earned his Psy.D. in clinical psychology at Marshall University in West Virginia. He worked as an assistant professor in the Joan C. Edwards School of Medicine, specializing in integrated care in the departments of family medicine, oncology, addiction services, and outpatient psychiatric services. He was the principal investigator in several clinical studies, he has presented at national conferences, and he has authored or co-authored five peer-reviewed articles.

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His background includes Master's degrees in Industrial-Organization Psychology, and in Clinical Pastoral Care. He worked as an education coordinator in Oregon's Asante Health System, providing support to hospice staff and patients. He was also a founding member and chair of the Healthy Connections Coalition in West Virginia, which addresses gaps in local addiction and recovery services.

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Dr. Nieuwenhuizen works with a wide variety of presenting issues, including mood and anxiety disorders, post traumatic stress disorder, addictions, and attention-deficit disorders. He sees children, teens, and adults for therapy, in addition to conducting psychological tests and evaluations.