Board-certified psychiatry with a focus on complex mood and psychotic disorders defines the Bankers Hill practice of Dr. John Sullivan on Fourth Avenue in downtown San Diego. His MD from the University of Texas Medical Branch (2007) and psychiatry residency at UC San Diego Medical Center (2007-2011) inform a diagnostic approach to conditions ranging from treatment-resistant depression to schizophrenia, a clinical scope complementary to the medical-specialty evaluations at Corrie Broudy, MD's Bankers Hill practice. Affiliation with UC San Diego Medical Center provides access to academic consultation resources for medication-refractory cases requiring augmentation strategies or clozapine protocols. Geriatric psychiatric assessments at this Fourth Avenue location coordinate with residential care providers including HarborView Senior Assisted Living for patients requiring structured behavioral support. Highest-complexity services include psychopharmacologic management utilizing CYP450 pharmacogenomic testing, lithium-level monitoring, and clozapine titration under current APA practice guideline protocols.