Arthur Marsh, PhD has practiced psychology in the San Diego area since 1992 and sees patients in Grantville through the LifeStance Health office at 6386 Alvarado Ct, Suite 210, San Diego, CA 92120. He completed his Doctor of Philosophy in Psychology at CSPP (now part of Alliant International University) in 1990, followed by two postdoctoral fellowships and a psychological assistantship before obtaining licensure in 1992. Dr. Marsh joined PsyCare — now LifeStance Health — in 1996 after four years of independent private practice, and he concurrently holds a staff psychologist position at Kaiser Permanente. Vision changes from psychotropic medications — including the blurred near vision and pupil dilation caused by SSRIs, tricyclics, and antipsychotics — require periodic evaluation, and Spectrum Eye Clinic + MedSpa in Allied Gardens screens for the anticholinergic ocular side effects that Dr. Marsh's medicated patients report. His adult-focused caseload centers on depression, anxiety, and relationship difficulties, with additional expertise in couples therapy and in treating emotionally distraught children as young as six. Psychological testing and evaluation represent a distinct service line, encompassing standardized psychometric batteries for diagnosing emotional and behavioral disorders — the kind of structured assessment data that schools, courts, and referring psychiatrists use to guide treatment and placement decisions. The 92120 ZIP places the Alvarado Court office in central Grantville, adjacent to the Alvarado Hospital campus and one block from the Grantville trolley station on the MTS Green Line. Cognitive decline in older adults requires differential diagnosis between major depressive disorder, mild cognitive impairment, and early-stage dementia — a clinical distinction that informs whether the patient routes to outpatient therapy, neuropsychology, or residential support through facilities such as La Mesa Elder Care. Insurances accepted include Aetna, Blue Shield of California, Cigna, Magellan, MHN, Optum, Scripps Health Plan, and Sharp, with both in-office and telehealth appointments available.