Garrett Ash, PhD
Assistant Professor of Medicine (General Medicine), Assistant Professor of Biomedical Informatics and Data ScienceCards
Appointments
Contact Info
Yale School of Medicine
Section of General Internal Medicine, 100 Church Street South
New Haven, CT 06519
United States
About
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Titles
Assistant Professor of Medicine (General Medicine), Assistant Professor of Biomedical Informatics and Data Science
Biography
Dr. Garrett Ash is a biomedical informatics researcher and exercise physiologist whose work develops the analytic infrastructure necessary to translate wearable and patient-generated health data into rigorous science and improved clinical care. He holds joint appointments in General Internal Medicine and Biomedical Informatics and Data Science at Yale School of Medicine, with a concurrent appointment as a Research Health Scientist at VA Connecticut Healthcare System.
Dr. Ash's research program integrates behavioral science, diabetes technology, and computational methods to address a foundational problem in digital health: how to make data from continuous glucose monitors, insulin pumps, and wearable activity sensors analytically tractable, clinically meaningful, and reusable across studies. His federally funded research portfolio spans NIDDK, VA, and foundation mechanisms, including an active K01 career development award and multiple R01 applications under review. Recent collaborations have produced co-authored work in Cell on AI-based digital phenotyping from wearables, in JAMA Network Open on a wearable-supported behavioral randomized trial, and in Human Factors in Healthcare on integrated visualization of patient-generated health data.
A defining theme of Dr. Ash's career has been leadership in standards development for digital health data. He authored the first international consensus standard for wearable devices in sport and exercise medicine (Sports Medicine, 2021) and currently contributes to standards-setting bodies including the IEEE working group on sport tracking technologies, the International Society for Pediatric and Adolescent Diabetes Clinical Practice Guidelines, the editorial board of the Journal of Diabetes Science and Technology, and the Sports Tech Research Network Quality Assessment Framework. He also serves on NIH and VA study sections.
Dr. Ash trained in chemistry at Swarthmore College, in athletic performance science at the University of Oxford (MSc), and in exercise physiology at the University of Connecticut (PhD). His postdoctoral training at Yale spanned nursing, psychiatry, and biomedical informatics.
Appointments
General Internal Medicine
Assistant ProfessorPrimaryBiomedical Informatics & Data Science
Assistant ProfessorSecondary
Other Departments & Organizations
Education & Training
- Associated Health Fellow
- Veterans Affairs Connecticut Health Center (2022)
- PhD
- University of Connecticut, Exercise Physiology (2015)
- MSc
- University of Oxford, Science and Medicine of Athletic Performance (2009)
- BA
- Swarthmore College, Chemistry (2005)
Research
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Research Projects
Implementing Physical Activity Screening and Interventions into Clinical Settings for People with HIV (PWH)
General Internal Medicine / , parent organization of Phoenix Lab
ORCID
0000-0002-8655-7525- View Lab Website
Garrett Ash Lab
Research at a Glance
Yale Co-Authors
Publications Timeline
Sangchoon Jeon, PhD
Lisa Fucito, PhD
Soohyun Nam, PhD, ANP (BC), APRN
Stuart Alan Weinzimer, MD
Nancy Schmieder Redeker, RN, MSN, PhD, FAHA, FAAN
Kelly S. DeMartini, PhD
Publications
2026
Expanding continuous glucose monitoring's potential from real-time safety to lifestyle support in type 1 diabetes exercise: a proof-of-concept study among adults with low baseline exercise levels
Chung Y, Ash G, Jeon S, Ramachandran R, Stults-Kolehmainen M, Spanakis E, Fucito L. Expanding continuous glucose monitoring's potential from real-time safety to lifestyle support in type 1 diabetes exercise: a proof-of-concept study among adults with low baseline exercise levels. Human Factors In Healthcare 2026, 10: 100154. DOI: 10.1016/j.hfh.2026.100154.Peer-Reviewed Original ResearchVirtual Diabetes Optimization Program (VDOP) for Veterans With Uncontrolled Diabetes
Adel T, Hansen J, Taxman J, Reetz-Norton M, Johnson C, Ljubic N, Ash G, Whittle J, Mendez C. Virtual Diabetes Optimization Program (VDOP) for Veterans With Uncontrolled Diabetes. Diabetes Obesity And Cardiometabolic CARE 2026 DOI: 10.2337/doc26-0020.Peer-Reviewed Original ResearchAltmetricFeasibility, acceptability, and usability of a novel self-monitoring program utilizing a consumer-grade wearable device paired with sleep-related patient-reported outcomes for veterans with obstructive sleep apnea
Mak S, Ghadimi S, Der-McLeod E, Naeem S, Moore V, Gil L, Chohan M, Zeidler M, Ash G, Fung C. Feasibility, acceptability, and usability of a novel self-monitoring program utilizing a consumer-grade wearable device paired with sleep-related patient-reported outcomes for veterans with obstructive sleep apnea. Human Factors In Healthcare 2026, 10: 100147. PMID: 42549209, PMCID: PMC13431043, DOI: 10.1016/j.hfh.2026.100147.Peer-Reviewed Original ResearchPerceptions of adults with type 1 diabetes mellitus about diabetes management and exercise
Swaminath M, Griggs S, Lukasik J, Spanakis E, Kinney R, Ash G. Perceptions of adults with type 1 diabetes mellitus about diabetes management and exercise. Human Factors In Healthcare 2026, 10: 100146. PMID: 42524453, PMCID: PMC13411111, DOI: 10.1016/j.hfh.2026.100146.Peer-Reviewed Original ResearchAltmetricDeveloping a human factors-informed onboarding workflow for digital health programs: lessons from a virtual type 2 diabetes self-management program
Mak S, Patterson E, Lacko J, Kinney R, Der-McLeod E, Chuang V, Fung C, Ash G. Developing a human factors-informed onboarding workflow for digital health programs: lessons from a virtual type 2 diabetes self-management program. Human Factors In Healthcare 2026, 9: 100139. DOI: 10.1016/j.hfh.2026.100139.Peer-Reviewed Original ResearchAltmetricAccess To and Utilization of Continuous Glucose Monitoring (CGM) among U.S. Veterans of Black and/or Hispanic Descent.
Kinney R, Tsai J, Weber J, McInnes D, Szymkowiak D, Mak S, Ash G, Wallace K, Harasim A, Abbott A, Copeland L. Access To and Utilization of Continuous Glucose Monitoring (CGM) among U.S. Veterans of Black and/or Hispanic Descent. Journal Of Health Care For The Poor And Underserved 2026, 37: 692-704. PMID: 42290359, DOI: 10.1353/hpu.2026.a992137.Peer-Reviewed Original ResearchDirectly engaging patients with glucose management: integrated visualization of personal device data for use between traditional visits
Patterson E, Lacko J, Der-McLeod E, Chuang V, Ash G, Fung C, Mak S. Directly engaging patients with glucose management: integrated visualization of personal device data for use between traditional visits. Human Factors In Healthcare 2026, 9: 100131. PMID: 42369595, PMCID: PMC13299437, DOI: 10.1016/j.hfh.2026.100131.Peer-Reviewed Original ResearchAssociations Between Sleep Quality and Continuous Glucose Monitoring‐Derived Metrics in Individuals With Type 2 Diabetes
Nam S, Lee M, Jeon S, Ash G, Weinzimer S, Whittemore R. Associations Between Sleep Quality and Continuous Glucose Monitoring‐Derived Metrics in Individuals With Type 2 Diabetes. Journal Of Sleep Research 2026, 35: e70331. PMID: 41902329, PMCID: PMC13357892, DOI: 10.1111/jsr.70331.Peer-Reviewed Original ResearchDeployment of an Activity Monitoring Program to Complement a Clinical Intervention for Veterans With Gulf War Illness: Qualitative Study
Mak S, McManus P, Greer S, Haws K, Carlson C, Chandler H, Osinubi O, Ash G. Deployment of an Activity Monitoring Program to Complement a Clinical Intervention for Veterans With Gulf War Illness: Qualitative Study. JMIR Human Factors 2026, 13: e82177. PMID: 41860162, PMCID: PMC13049394, DOI: 10.2196/82177.Peer-Reviewed Original ResearchAltmetricTesting Multiple Delivery Methods of the Virtual Exercise Games for Youth with T1D Peer Intervention: Protocol Development and Feasibility
Ash G, Nam S, Mak S, Stults-Kolehmainen M, Haughton A, Turek C, Baker J, Hieftje K, Marks A, Chmielewski A, Shelver M, Considine E, Lukasik J, Weinzimer S, Nally L. Testing Multiple Delivery Methods of the Virtual Exercise Games for Youth with T1D Peer Intervention: Protocol Development and Feasibility. Hormone Research In Paediatrics 2026, 1-18. PMID: 41697894, PMCID: PMC12971191, DOI: 10.1159/000550880.Peer-Reviewed Original ResearchCitationsAltmetric
Academic Achievements & Community Involvement
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Activities
activity Advisory Committee for Master of Science in Human Performance & Clinical Exercise Physiology
2022 - PresentAdvisory BoardsMemberDetailsSouthern Connecticut State Universityactivity Journal of Strength and Conditioning Research
2016 - PresentJournal ServiceAssociate Editoractivity Sports Tech Research Network
2021 - PresentProfessional OrganizationsScientific CommitteeDetailsQuality Assessment of Sport Technologies’ Special Interest Groupactivity Sports Tech Research Network
2022 - PresentMeeting Planning and ParticipationCommittee MemberDetailsCommittee planning first annual summitactivity Running Across Borders
2009 - PresentPublic ServiceFounding MemberDetailsSocial Enterprise focused on grassroots athletics, education, and sports travel in East Africa. Partner with Town of Runners award-winning documentary and featured in press (Runnersworld, Scientific American, CNN, BBC)
Honors
honor Diabetes Special Interest Group Innovative Research Award
03/14/2024National AwardSociety of Behavioral Medicinehonor Yale Innovation Summit ePoster Winner (Health)
05/31/2023Yale University AwardYale VenturesDetailsUnited Stateshonor Yale Lifesciences Pitchfest Semifinalist
12/08/2022Yale University AwardOffice of Cooperative ResearchDetailsUnited Stateshonor Yale Lifesciences Pitchfest Semifinalist
12/03/2021Yale University AwardOffice of Cooperative ResearchDetailsUnited Stateshonor Top Reviewers for Clinical Medicine Award
07/16/2018International AwardPublonsDetailsNew Zealand
News
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News
- June 30, 2026
Women’s Health Research at Yale and SWHR’s Symposium Highlights the Power of Collaboration to Advance Women’s Health Research
- July 18, 2025Source: Yale News
For Young Adults, Improved Sleep Is Incentive to Drink Less
- December 03, 2024Source: Nature Digital Medicine
Natural Language Processing in Mixed-Methods Evaluation of a Digital Sleep-Alcohol Intervention For Young Adults
- August 05, 2024
Meet Yale Internal Medicine: Garrett Ash, PhD
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Contacts
Yale School of Medicine
Section of General Internal Medicine, 100 Church Street South
New Haven, CT 06519
United States