Nicholas R. Farrell, PhD, is affiliated with NOCD, Inc. in Chicago, Illinois. Farrell has published research on exposure-based video therapy for obsessive-compulsive disorder and posttraumatic stress disorder, as well as therapist-delivered video therapy habit reversal training for body-focused repetitive behaviors in both youth and adults. His work focuses on obsessive-compulsive and related disorders, child and adolescent psychiatry, posttraumatic stress disorder, and psychotherapy. Farrell's publications appeared in Psychiatrist.com in 2026.
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