Protocol Healthspan
Consultants + Specialists
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Meet Your
Care Team
Our team is made up of a dynamic partnership between our Protocol Care Team and our Concierge Primary Care Physicians and their support staff. Learn More about who you will be getting to know below.
Protocol Healthspan
Consultants + Specialists
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Dr. Kerri Masutto
Healthspan Specialist + Protocol CoFounder
Kerri started out her career in traditional primary care, exploring many different delivery models, including interdisciplinary teams at companies like Visa and Western Digital, at on-site wellness centers for Silicon Valley tech companies. She then ventured into functional medicine, health optimization, and obesity medicine startups where she led high growth expansion of care.
She led the clinical operations and medical teams at companies like Parsley Health and Tony Robbins Life Force. She spent almost a decade designing innovative wellness protocols and delivery systems and training dozens of doctors to deliver this kind of care to tens of thousands of patients across the country.
Education
MD | University of Illinois College of Medicine at Chicago
Residency, Internal Medicine, Advocate Health Care/Advocate | Lutheran General Hospital
Experience
Internal Medicine | American Board of Internal Medicine
Certified Practitioner | The Institute for Functional Medicine
Protocol Concierge
Primary Care Physicians
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Dr. Leslie Fang
Gallagher Chair of Clinical Excellence
A clinician and a teacher, he maintains an active international practice in Internal Medicine and Nephrology and is a leading teacher at Harvard Medical School. He has received numerous awards for excellence in teaching from Harvard Medical School and Massachusetts General Hospital.
Education
MD | Harvard Medical School
PhD | University of Illinois Urbana Champaign
Residency | Massachusetts General Hospital
Fellowship | Massachusetts General Hospital
Board Certifications
Internal Medicine | American Board of Internal Medicine
Nephrology | American Board of Internal Medicine
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Concierge Care, LLC (Dr. Leslie Fang’s practice) is a premier concierge primary care practice led by Harvard–trained physicians with longstanding academic affiliations and national recognition for clinical and teaching excellence. The practice emphasizes longitudinal, relationship-based care and serves a diverse patient population, including individuals with complex medical needs and those seeking highly personalized preventive care.
Physicians in the practice have received multiple awards for excellence in teaching and clinical service from major academic medical centers and maintain active roles in medical education. The practice integrates evidence-based internal medicine with a personalized approach that prioritizes continuity, proactive health management, and thoughtful care coordination.
Dr. Ajay Haryani trained at the world’s top institutions and bridges worlds that rarely meet. He is a Board-Certified Internal Medicine physician and Assistant Clinical Professor of Medicine at Mount Sinai, with an expert understanding of chronic disease, longevity, fitness, and nutrition.
Unlike most physicians who focus solely on illness, or wellness experts who lack medical training, he brings knowledge of how the body functions in both health and disease – where we thrive and where we falter. He develops personalized care plans that address the full spectrum of health needs, from cardiometabolic health and weight management to emotional health and complex chronic conditions. He is also a Certified Personal Trainer and avid cyclist.
Most recently, he worked with the founder of One Medical (Dr. Tom Lee) to build the cutting-edge primary care company Galileo, supervising doctors and clinical operations across the country. He currently advises leading digital health companies focused on primary care, nutrition and mental health.
Credentials
