John L. Hessler, PhD in Chula Vista holds California psychology license PSY 9643 and NPI 1548306269, providing clinical psychology services from the Third Avenue corridor. The practice's scope covers ADHD, bipolar disorder, and depression, and behavioral assessments for adults and adolescents complement the family-focused counseling track that Pathways Family Therapy Chula Vista runs in the same South Bay service area. Acceptance of Medicare and Medicaid expands clinical access for Chula Vista's underserved populations in ZIP 91911, where demand for psychological testing and diagnostic evaluation remains high. The 815 Third Avenue office suite sits in the same multi-provider building that houses several behavioral health practitioners, and the practice coordinates stress-related somatic referrals through body-based providers including Wachs Chiropractic Health Center for patients presenting with concurrent musculoskeletal tension. The practice's highest-complexity evaluations involve structured psychodiagnostic test batteries for ADHD differential diagnosis, integrating continuous performance measures with clinical interviews to distinguish primary attention-deficit presentations from comorbid mood and anxiety spectrum conditions.