THE TEAM
The specialists behind your protocol.
Every Halcyon member works directly with a dedicated clinical team. These are the people who read your data, interpret your results, and design your protocol.
Not an algorithm.
Dr. Sarah Okafor, MD
Clinical Medicine
Dr. Okafor joined Halcyon after 14 years at Johns Hopkins School of Medicine, where she led a longitudinal research program tracking metabolic and cardiovascular markers across 3,000+ patients. Her clinical philosophy is simple: the body communicates long before it breaks down. The job of a good physician is to listen early enough to act.
At Halcyon, she oversees all clinical protocols and serves as the primary physician for members in the Clinical Medicine track. She reviews biomarker data weekly, flags early-stage anomalies, and works directly with each member to translate data into decisions. Every recommendation she makes is grounded in your specific numbers, your specific history, and your specific goals.
Her research has been published in The New England Journal of Medicine and JAMA Internal Medicine. She holds board certifications in Internal Medicine and Preventive Medicine.
14 yrs
EXPERIENCE
Johns Hopkins
BACKGROUND
Cardio · Metabolic
SPECIALIZATION
Dr. James Alcott, MD, PhD
Longevity & Biohacking
Dr. Alcott spent 12 years at the Buck Institute for Research on Aging, one of the world's leading organizations dedicated to understanding the biology of aging. His doctoral work focused on epigenetic clocks and their relationship to metabolic health, guided by one question: what does your biology say about how fast you're actually aging?
At Halcyon, he works with members interested in biological age assessment and evidence-based longevity interventions. He's rigorous about evidence and deeply skeptical of trends — if an intervention doesn't have a clear mechanism and data to support it, it doesn't make it into a Halcyon protocol.
His work has been featured in Nature Aging and Cell Metabolism. He holds dual board certifications in Internal Medicine and Geriatric Medicine.
12 yrs
EXPERIENCE
Buck Institute
BACKGROUND
Aging · Epigenetics
SPECIALIZATION
Dr. Marcus Rhee, PhD
Metabolic Health
Before joining Halcyon, Dr. Rhee spent 11 years as a research lead at the Broad Institute of MIT and Harvard, building predictive models for metabolic dysfunction across longitudinal datasets of 200,000+ patient records. He came to Halcyon to apply population-level precision to individual care.
At Halcyon, he leads the biomarker research program and oversees the computational systems powering continuous monitoring. He works with members in the Metabolic Health track — interpreting glucose patterns, lipid dynamics, and hormonal data to build a precise picture of how your metabolism actually functions.
He holds a PhD in Computational Biology from MIT and has published in Nature Medicine and Science Translational Medicine.
11 yrs
EXPERIENCE
Broad Institute
BACKGROUND
Genomics · Predictive Models
SPECIALIZATION
Dr. Elena Vasquez, PhD
Sports & Performance
Dr. Vasquez spent nine years as Performance Science Director for the US Olympic Committee, responsible for physiological assessment and recovery protocols of elite athletes across 12 sports. She brings that same level of rigor to every Halcyon member — regardless of whether they compete professionally.
At Halcyon, she leads the Sports & Performance track, designing protocols that optimize physical output while protecting long-term health. Her approach centers on three variables: recovery quality, HRV patterns, and VO2 max trajectory. Performance and longevity are not in conflict — when built correctly, a protocol that makes you perform better today also makes you healthier at 70.
She holds a PhD in Exercise Physiology from Stanford and is a certified specialist in Sports Dietetics and Strength & Conditioning.
09 yrs
EXPERIENCE
US Olympic Committee
BACKGROUND
HRV · Recovery · VO2
SPECIALIZATION
Dr. Lena Hartmann, MD
Neuroscience
Dr. Hartmann trained at the Max Planck Institute for Brain Research before completing her clinical residency in Neurology at Charité — Universitätsmedizin Berlin. Her research focuses on the relationship between sleep architecture, neurological health, and cognitive performance — the brain is a biological system, and biological systems respond to data-driven intervention.
At Halcyon, she builds protocols around sleep quality, stress physiology, and neurological biomarkers — with particular focus on early identification of cognitive risk factors that standard care routinely misses. Protecting the brain requires the same longitudinal precision as protecting the heart.
Her work has been published in Nature Neuroscience and the Journal of Sleep Research. She holds board certifications in Neurology and Sleep Medicine.
10 yrs
EXPERIENCE
Max Planck Institute
BACKGROUND
Sleep · Cognition · Stress
SPECIALIZATION
Dr. Sarah Okafor, MD
Clinical Medicine
Dr. Okafor joined Halcyon after 14 years at Johns Hopkins School of Medicine, where she led a longitudinal research program tracking metabolic and cardiovascular markers across 3,000+ patients. Her clinical philosophy is simple: the body communicates long before it breaks down. The job of a good physician is to listen early enough to act.
At Halcyon, she oversees all clinical protocols and serves as the primary physician for members in the Clinical Medicine track. She reviews biomarker data weekly, flags early-stage anomalies, and works directly with each member to translate data into decisions. Every recommendation she makes is grounded in your specific numbers, your specific history, and your specific goals.
Her research has been published in The New England Journal of Medicine and JAMA Internal Medicine. She holds board certifications in Internal Medicine and Preventive Medicine.
14 yrs
EXPERIENCE
Johns Hopkins
BACKGROUND
Cardio · Metabolic
SPECIALIZATION
Dr. James Alcott, MD, PhD
Longevity & Biohacking
Dr. Alcott spent 12 years at the Buck Institute for Research on Aging, one of the world's leading organizations dedicated to understanding the biology of aging. His doctoral work focused on epigenetic clocks and their relationship to metabolic health, guided by one question: what does your biology say about how fast you're actually aging?
At Halcyon, he works with members interested in biological age assessment and evidence-based longevity interventions. He's rigorous about evidence and deeply skeptical of trends — if an intervention doesn't have a clear mechanism and data to support it, it doesn't make it into a Halcyon protocol.
His work has been featured in Nature Aging and Cell Metabolism. He holds dual board certifications in Internal Medicine and Geriatric Medicine.
12 yrs
EXPERIENCE
Buck Institute
BACKGROUND
Aging · Epigenetics
SPECIALIZATION
Dr. Marcus Rhee, PhD
Metabolic Health
Before joining Halcyon, Dr. Rhee spent 11 years as a research lead at the Broad Institute of MIT and Harvard, building predictive models for metabolic dysfunction across longitudinal datasets of 200,000+ patient records. He came to Halcyon to apply population-level precision to individual care.
At Halcyon, he leads the biomarker research program and oversees the computational systems powering continuous monitoring. He works with members in the Metabolic Health track — interpreting glucose patterns, lipid dynamics, and hormonal data to build a precise picture of how your metabolism actually functions.
He holds a PhD in Computational Biology from MIT and has published in Nature Medicine and Science Translational Medicine.
11 yrs
EXPERIENCE
Broad Institute
BACKGROUND
Genomics · Predictive Models
SPECIALIZATION
Dr. Elena Vasquez, PhD
Sports & Performance
Dr. Vasquez spent nine years as Performance Science Director for the US Olympic Committee, responsible for physiological assessment and recovery protocols of elite athletes across 12 sports. She brings that same level of rigor to every Halcyon member — regardless of whether they compete professionally.
At Halcyon, she leads the Sports & Performance track, designing protocols that optimize physical output while protecting long-term health. Her approach centers on three variables: recovery quality, HRV patterns, and VO2 max trajectory. Performance and longevity are not in conflict — when built correctly, a protocol that makes you perform better today also makes you healthier at 70.
She holds a PhD in Exercise Physiology from Stanford and is a certified specialist in Sports Dietetics and Strength & Conditioning.
09 yrs
EXPERIENCE
US Olympic Committee
BACKGROUND
HRV · Recovery · VO2
SPECIALIZATION
Dr. Lena Hartmann, MD
Neuroscience
Dr. Hartmann trained at the Max Planck Institute for Brain Research before completing her clinical residency in Neurology at Charité — Universitätsmedizin Berlin. Her research focuses on the relationship between sleep architecture, neurological health, and cognitive performance — the brain is a biological system, and biological systems respond to data-driven intervention.
At Halcyon, she builds protocols around sleep quality, stress physiology, and neurological biomarkers — with particular focus on early identification of cognitive risk factors that standard care routinely misses. Protecting the brain requires the same longitudinal precision as protecting the heart.
Her work has been published in Nature Neuroscience and the Journal of Sleep Research. She holds board certifications in Neurology and Sleep Medicine.
10 yrs
EXPERIENCE
Max Planck Institute
BACKGROUND
Sleep · Cognition · Stress
SPECIALIZATION
Dr. Sarah Okafor, MD
Clinical Medicine
Dr. Okafor joined Halcyon after 14 years at Johns Hopkins School of Medicine, where she led a longitudinal research program tracking metabolic and cardiovascular markers across 3,000+ patients. Her clinical philosophy is simple: the body communicates long before it breaks down. The job of a good physician is to listen early enough to act.
At Halcyon, she oversees all clinical protocols and serves as the primary physician for members in the Clinical Medicine track. She reviews biomarker data weekly, flags early-stage anomalies, and works directly with each member to translate data into decisions. Every recommendation she makes is grounded in your specific numbers, your specific history, and your specific goals.
Her research has been published in The New England Journal of Medicine and JAMA Internal Medicine. She holds board certifications in Internal Medicine and Preventive Medicine.
14 yrs
EXPERIENCE
Johns Hopkins
BACKGROUND
Cardio · Metabolic
SPECIALIZATION
Dr. James Alcott, MD, PhD
Longevity & Biohacking
Dr. Alcott spent 12 years at the Buck Institute for Research on Aging, one of the world's leading organizations dedicated to understanding the biology of aging. His doctoral work focused on epigenetic clocks and their relationship to metabolic health, guided by one question: what does your biology say about how fast you're actually aging?
At Halcyon, he works with members interested in biological age assessment and evidence-based longevity interventions. He's rigorous about evidence and deeply skeptical of trends — if an intervention doesn't have a clear mechanism and data to support it, it doesn't make it into a Halcyon protocol.
His work has been featured in Nature Aging and Cell Metabolism. He holds dual board certifications in Internal Medicine and Geriatric Medicine.
12 yrs
EXPERIENCE
Buck Institute
BACKGROUND
Aging · Epigenetics
SPECIALIZATION
Dr. Marcus Rhee, PhD
Metabolic Health
Before joining Halcyon, Dr. Rhee spent 11 years as a research lead at the Broad Institute of MIT and Harvard, building predictive models for metabolic dysfunction across longitudinal datasets of 200,000+ patient records. He came to Halcyon to apply population-level precision to individual care.
At Halcyon, he leads the biomarker research program and oversees the computational systems powering continuous monitoring. He works with members in the Metabolic Health track — interpreting glucose patterns, lipid dynamics, and hormonal data to build a precise picture of how your metabolism actually functions.
He holds a PhD in Computational Biology from MIT and has published in Nature Medicine and Science Translational Medicine.
11 yrs
EXPERIENCE
Broad Institute
BACKGROUND
Genomics · Predictive Models
SPECIALIZATION
Dr. Elena Vasquez, PhD
Sports & Performance
Dr. Vasquez spent nine years as Performance Science Director for the US Olympic Committee, responsible for physiological assessment and recovery protocols of elite athletes across 12 sports. She brings that same level of rigor to every Halcyon member — regardless of whether they compete professionally.
At Halcyon, she leads the Sports & Performance track, designing protocols that optimize physical output while protecting long-term health. Her approach centers on three variables: recovery quality, HRV patterns, and VO2 max trajectory. Performance and longevity are not in conflict — when built correctly, a protocol that makes you perform better today also makes you healthier at 70.
She holds a PhD in Exercise Physiology from Stanford and is a certified specialist in Sports Dietetics and Strength & Conditioning.
09 yrs
EXPERIENCE
US Olympic Committee
BACKGROUND
HRV · Recovery · VO2
SPECIALIZATION
Dr. Lena Hartmann, MD
Neuroscience
Dr. Hartmann trained at the Max Planck Institute for Brain Research before completing her clinical residency in Neurology at Charité — Universitätsmedizin Berlin. Her research focuses on the relationship between sleep architecture, neurological health, and cognitive performance — the brain is a biological system, and biological systems respond to data-driven intervention.
At Halcyon, she builds protocols around sleep quality, stress physiology, and neurological biomarkers — with particular focus on early identification of cognitive risk factors that standard care routinely misses. Protecting the brain requires the same longitudinal precision as protecting the heart.
Her work has been published in Nature Neuroscience and the Journal of Sleep Research. She holds board certifications in Neurology and Sleep Medicine.
10 yrs
EXPERIENCE
Max Planck Institute
BACKGROUND
Sleep · Cognition · Stress
SPECIALIZATION