Dr. Jay Luthar and Dr. Julia Loewenthal have been named 2026 Castle Connolly Top Doctors, marking their second consecutive year receiving this designation that only 7 percent of the nation's licensed physicians achieve annually. The recognition is based on peer nominations and rigorous review by Castle Connolly's physician-led research team, which evaluates medical education, training, hospital appointments, and disciplinary histories without allowing doctors to pay for inclusion. Both physicians practice at Lutanen Health, a primary care and longevity practice in Boston's Back Bay that limits each doctor to 150 patients, contrasting sharply with traditional volume-driven models and integrating longevity science into everyday care.
At Lutanen Health, primary care transforms into private health management that identifies risks before symptoms emerge and allocates interventions across a lifespan to preserve vigor and delay decline. The practice evaluates and treats primary conditions with particular focus on metabolic health, cardiovascular risk reduction, cognitive preservation, and healthy aging. Their clinical team specializes in managing complex internal medicine cases while addressing unique needs of older patients, including frailty risk, medication optimization, and age-related vitality. The practice incorporates advanced diagnostic technologies including AI-guided plaque detection, multi-cancer early detection blood testing, VO₂ max testing, biological age tracking, advanced biomarker and genetic analysis, comprehensive fitness and mobility assessment, and structured sleep evaluation.
The newly designed 3,000 square foot facility includes a state-of-the-art human performance laboratory and offers amenities reflecting their relationship-driven model: extended visits, same-day appointments, 24/7 physician access, individualized nutrition counseling, and select home visits. "The Castle Connolly recognition affirms what I believe matters most in medicine: time, trust, and partnership," said Dr. Luthar, emphasizing their shared conviction that care should be uniquely designed for each individual patient. Both physicians bring specialized training to their practice, with Dr. Luthar completing his medical residency at Cambridge Hospital, a Harvard Internal Medicine Residency Site, and board-certified in Internal Medicine, Integrative Medicine, and Lifestyle Medicine, while Dr. Loewenthal completed her Internal Medicine residency at Brigham and Women's Hospital and her fellowship in Geriatric Medicine through the Harvard Multi-Campus Geriatrics Program.
Maintaining academic faculty roles at Harvard Medical School, where Dr. Luthar serves as an Instructor and Dr. Loewenthal serves as an Assistant Professor, their work bridges clinical care, education, and research to advance the science of healthy aging. Their recognition as Top Doctors highlights a growing movement toward preventive, relationship-based medicine that prioritizes long-term health outcomes over reactive treatment. Castle Connolly publishes its Top Doctors list at https://www.castleconnolly.com and in various print and online partner publications, providing a resource for patients seeking highly qualified physicians who exemplify this evolving approach to healthcare.
