longevity experts

Julie Gibson Clark
A 56-year-old single mom from Phoenix, Arizona, Clark is a biohacker who ages 34% slower than average (0.665 biological years per chronological year), ranking second in the 2023 Rejuvenation Olympics. Her budget-friendly routine (~$12/day) emphasizes a vegetable-rich diet (1 pound daily), regular exercise (cardio, strength, sauna), meditation, and supplements like NOVOS Core. Inspired by her NASA astronaut father, she prioritizes sleep, stress reduction, and affordability, outperforming high-spending biohackers like Bryan Johnson. Julie Gibson Clark

Bryan Johnson
A 47-year-old tech entrepreneur (founder of Braintree Venmo), Johnson is known for his extreme anti-aging Blueprint Protocol, spending ~$2 million annually. His regimen includes 100+ daily supplements, a strict plant-forward diet, exercise, and controversial therapies like plasma transfusions from his son. He claims to have reduced his epigenetic age, with a DunedinPACE score of 0.66, though experts question some claims. He launched the Rejuvenation Olympics to track biological aging. Bryan Johnson

David Sinclair
A Harvard geneticist and leading longevity researcher, Sinclair studies sirtuins and NAD+ pathways to slow aging. Author of Lifespan, he promotes resveratrol, NMN supplements, and lifestyle interventions like intermittent fasting and exercise. His work focuses on cellular health and epigenetic reprogramming, making him a prominent voice in anti-aging science.

Peter Attia
A physician and longevity expert, Attia focuses on optimizing healthspan through his podcast The Drive and medical practice. He emphasizes exercise (strength and VO2 max training), nutrition (low-carb or ketogenic diets), sleep, and stress management. His data-driven approach bridges science and practical application, influencing biohackers like Julie Clark.

Aubrey de Grey
A biomedical gerontologist and founder of the SENS Research Foundation, de Grey argues aging is a treatable disease. His “Strategies for Engineered Negligible Senescence” target seven types of cellular damage (e.g., mitochondrial mutations, senescent cells). A controversial figure, he advocates for radical life extension through biotech interventions.

Matt Kaeberlein
A University of Washington biologist, Kaeberlein researches aging mechanisms, particularly mTOR pathways and rapamycin’s potential to extend lifespan. He co-founded the Dog Aging Project to study longevity in canines, translating findings to humans. His work emphasizes evidence-based interventions over hype.

George Church
A Harvard geneticist and synthetic biology pioneer, Church explores gene editing (CRISPR) and rejuvenation therapies to combat aging. His lab investigates reversing age-related decline through genetic interventions, and he co-founded companies like Colossal Biosciences to advance biotech solutions.

Brian Kennedy
A biochemist and director at the National University of Singapore’s Centre for Healthy Longevity, Kennedy studies aging pathways like sirtuins and mTOR. He researches interventions (e.g., alpha-ketoglutarate) to extend healthspan and translates lab findings into clinical applications.

Peter Diamandis
An entrepreneur and founder of the XPRIZE Foundation, Diamandis promotes longevity through innovation and technology. Co-author of The Future Is Faster Than You Think, he advocates for AI, biotech, and personalized medicine to extend human lifespan, bridging science with public engagement.

Morgan Levine
A Yale epigenetics researcher, Levine develops advanced epigenetic clocks (e.g., DunedinPACE) to measure biological aging. She critiques overstated claims, like Bryan Johnson’s, emphasizing that lifestyle (diet, exercise, sleep) drives most longevity benefits, not extreme interventions.

Kara Fitzgerald
A functional medicine practitioner and author of Younger You, Fitzgerald focuses on epigenetic optimization through diet, stress management, and supplements. Her protocols, which influenced Julie Clark, emphasize methylation and lifestyle changes to reduce biological age.

Thomas Perls
A Boston University gerontologist, Perls directs the New England Centenarian Study, researching genetic and lifestyle factors in extreme longevity. He advocates for basic habits (exercise, healthy diet, no smoking) and cautions against unproven supplements or extreme biohacking.

Marion Nestle
A nutritionist and NYU professor emerita, Nestle promotes longevity through a balanced, minimally processed diet. She advises eating a variety of “real foods” and maintaining calorie balance, emphasizing simplicity over complex regimens for healthy aging.

S. Jay Olshansky
A University of Illinois epidemiologist, Olshansky studies aging’s biological limits and public health impacts. He supports exercise as a “fountain of youth” but questions the value of extreme biohacking, advocating for practical habits like weight management and stress reduction.

Douglas E. Vaughan
Director of Northwestern’s Potocsnak Longevity Institute, Vaughan researches aging biomarkers and interventions. He promotes evidence-based basics—exercise, healthy weight, sleep, and social connections—while exploring how to translate biohacking experiments into broader applications.