Sean Bell-Thomson, PhD, is a licensed clinical psychologist and co-founder of Thalassa Psychological Services, with practices in Sleepy Hollow and Manhattan, New York. He specializes in the treatment of personality disorders, complex trauma, suicidality, substance abuse, psychosis, bipolar disorder, and chronic patterns of high-risk behavior or treatment resistance. Dr. Bell-Thomson works with individuals and couples using an active, engaged, and direct therapeutic approach grounded in evidence-based practice, including Transference-Focused Psychotherapy and Emotionally Focused Couple Therapy. In addition to his clinical work, he supervises psychology trainees and serves as Volunteer Supervising Faculty in the Department of Psychiatry at Lenox Hill Hospital/Northwell Health, where he has received recognition for excellence in teaching. He earned his PhD in Clinical Psychology from Long Island University–Brooklyn and also provides psychotherapy in Spanish.