Katherine Nguyen Williams, PhD, is a licensed supervising psychologist, professor, and clinical faculty member in the department of psychiatry at the University of California, San Diego (UCSD). She is clinical training director of child and adolescent psychology, and director of the anxiety and OCD clinic at Rady Children’s Hospital Outpatient Psychiatry in San Diego, CA, where she provides child and adolescent therapy, and specializes in child and adolescent psychological assessments. She is also founding director of the Center for Child and Adolescent Testing (C-CAT). Nguyen Williams frequently provides clinical trainings, hospital workshops, and university courses on the topics of evidence-based practices, clinical research, and childhood disorders, both locally and nationally. In addition to an active clinical practice, she teaches and clinically supervises psychology students, marriage and family therapists, social workers, psychiatry fellows, and medical students about the application of modular cognitive behavioral therapy (CBT) for child and adolescent depression and anxiety.