Named to San Diego Magazine's Top Doctors list, Jon D. Harrison, MD is an internist practicing in Allied Gardens through Kaiser Permanente's Zion Medical Center at 4647 Zion Ave, San Diego, CA 92120. Harrison earned dual undergraduate degrees in pharmacology and toxicology from the University of Wisconsin, completed his MD at the University of Michigan Medical School in 1993, and trained in internal medicine residency at the UC San Diego Medical Center through 1996. That pharmacology background gives his medication-management work particular depth for patients on complex multi-drug regimens for cardiomyopathy, asthma, and chronic headache syndromes, with integrative pain cases moving into the acupuncture program at We Love Acupuncture on Mission Gorge Road in Grantville for traditional Chinese medicine protocols. The Zion Avenue campus sits in the Waring Road medical district, anchoring primary care for the Allied Gardens and Del Cerro residential zones within the 92120 ZIP, less than two miles south of SDSU. Harrison also practices at Kaiser's Otay Mesa location, extending his patient panel across southern San Diego. His approach to complex chronic illness includes weekly care-coordination calls for patients managing vascular dementia and ME/CFS, working alongside home caregivers to adjust treatment protocols in real time. Mental health components of chronic-illness management connect to the therapy team at Mary Bosker, Psychologist in the Grantville medical corridor for structured cognitive-behavioral interventions. Harrison stays physically active through hiking, swimming, and mountain biking in the Mission Trails Regional Park system northeast of the Zion Avenue campus.