Garrett Ash, PhD
Assistant Professor of Medicine (General Medicine), Assistant Professor of Biomedical Informatics and Data ScienceDownloadHi-Res Photo
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Appointments
General Internal Medicine
Primary
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.
Last Updated on May 10, 2026.
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
Frequent collaborators of Garrett Ash's published research.
Publications Timeline
A big-picture view of Garrett Ash's research output by year.
Lisa Fucito, PhD
Sangchoon Jeon, PhD
Soohyun Nam, PhD, ANP (BC), APRN
Stuart Alan Weinzimer, MD
Nancy Schmieder Redeker, RN, MSN, PhD, FAHA, FAAN
Kelly S. DeMartini, PhD
95Publications
1,531Citations
Publications
2026
2789-LB: Clinician Perspectives on Barriers to Mental Health Support and Digital Mindfulness Tools for Young Adults with Type 1 Diabetes
LUKASIK J, ASH G, MAK S, SHERR J, FUCITO L, NALLY L. 2789-LB: Clinician Perspectives on Barriers to Mental Health Support and Digital Mindfulness Tools for Young Adults with Type 1 Diabetes. Diabetes 2026, 75 DOI: 10.2337/db26-2789-lb.Peer-Reviewed Original ResearchConceptsMental health supportContinuity of careMental health resourcesHealth supportClinicians' perceptionsIntervention developmentClinician perspectivesHealth resourcesMental wellnessYoung adultsCare of young adultsRates of depressionDeductive thematic analysisNational InstituteSemi-structured interviewsNational Institutes of HealthT1D careDigital interventionsMultifaceted barriersInstitutes of HealthFeasibility trialHealth contentRoutine careAdult careThematic analysisDeveloping 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 ResearchAltmetricConceptsSelf-management programDigital health programsDigital health literacyHealth literacyHealth programsVA Connecticut Healthcare SystemProgram useDigital health interventionsEHealth Literacy ScaleDigital health toolsQuality improvement projectCase summariesLiteracy ScaleHealth interventionsHealth toolsMobile applicationsImprovement projectHealthcare systemType 2 diabetesRemote setupData-sharingOnboard processingMethods IndividualsProgram participantsDemographic characteristics1274 Practical Considerations for Using Pulse Oximetry Data from Smartwatches to Promote Self-Management of OSA
Thomas A, Mak S, Ash G, Der-Mcleod E, Ereso J, Naeem S, Liu J, Ghadimi S, Te T, Zeidler M, Liang L, Fung C. 1274 Practical Considerations for Using Pulse Oximetry Data from Smartwatches to Promote Self-Management of OSA. Sleep 2026, 49: a569-a569. DOI: 10.1093/sleep/zsag091.1273.Peer-Reviewed Original ResearchAccess 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 ResearchMeSH Keywords and ConceptsDirectly 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 ResearchConceptsTraditional visitsShared decision-makingDiabetes Self-ManagementWearable devicesQuality of lifeSelf-reported dataIntegrated visualizationPhysical activitySelf-ManagementReactions of patientsType 2 diabetesMultiple wearable devicesSelf-EfficacySleep qualityBehavioral changesGlucose managementActive choiceVisitsInterview protocolSynchronization supportInformation displayInformation partnersGlucose levelsCliniciansInterviewsAssociations 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, e70331. PMID: 41902329, DOI: 10.1111/jsr.70331.Peer-Reviewed Original ResearchConceptsPoor sleep qualityPittsburgh Sleep Quality IndexSleep qualityType 2 diabetesModifiable lifestyle factorsSelf-reported sleep qualitySleep Quality IndexAssociated with diabetes-related complicationsBody mass indexDiabetes-related complicationsMultivariate linear regressionCardiometabolic healthLifestyle factorsDepressive symptomsAddress sleepDiabetes managementMass indexPoor sleepSleep durationShort-term glycemic variabilityHyperglycemia riskGlycemic variabilityDiabetes durationClinical factorsSleep assessmentDeployment 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 ResearchAltmetricMeSH Keywords and ConceptsConceptsHealth coaching programActivity monitoring programCoaching programHealth coaching interventionSymptom self-managementActivity monitoringVirtual health coachPoor quality of lifeMental health needsGulf War IllnessPoor qualityQuality of lifeHealth coachingWellness goalsSymptom managementProgram feasibilityHealth needsCoaching interventionSelf-ManagementSemistructured interviewsPatient educationVerbal consentQualitative studyQualitative findingsVeteransTesting 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 ResearchCitationsConceptsModerate-to-vigorous physical activityActive videogamesPhysical activityExercise gamesLiving with diabetesSupportive environmentSelf-management skillsMultiple delivery methodsQuality of lifeSelf-ManagementIntervention impactPeer interventionsGoal settingAdult coachesGlycemic outcomesRole-modeling supportType 1 diabetesProtocol developmentCoachingDiverse youthInterventionPeer activitiesVR appsCliniciansSessions
2025
Oura Ring Behavioral Feedback Intervention for Alcohol Reduction in Young Adults: User Experience Evaluation of a Pilot Randomized Trial
Griffith F, Ellison O, Kunchay S, Augustine M, DeMartini K, Fatigate M, Latimer L, O'Malley S, Redeker N, Ash G, Fucito L. Oura Ring Behavioral Feedback Intervention for Alcohol Reduction in Young Adults: User Experience Evaluation of a Pilot Randomized Trial. Journal Of Medical Internet Research 2025, 27: e78613. PMID: 41343856, PMCID: PMC12677873, DOI: 10.2196/78613.Peer-Reviewed Original ResearchAltmetricMeSH Keywords and ConceptsConceptsNatural language processingUser baseLanguage processingUser experience evaluationFeedback reportsSmartphone diariesGroup participantsOura ringYoung adult alcohol useFitness wearablesFace-to-face exit interviewFeedback interventionYoung adultsExperience evaluationPilot randomized controlled trialAlcohol reductionMobile appsMultiple intervention componentsSMS text messagesPilot Randomized TrialAppsConvergent mixed methodsBehavioral dataUsersRandomized Controlled TrialsAugmenting management of obstructive sleep apnea with consumer wearable devices to increase use of positive airway pressure therapy: a pilot randomized trial
Fung C, Mak S, Ash G, Der-McLeod E, Ereso B, Naeem S, Liu J, Ghadimi S, Te T, Chan V, Hurtado J, Wong S, Zeidler M, Liang L. Augmenting management of obstructive sleep apnea with consumer wearable devices to increase use of positive airway pressure therapy: a pilot randomized trial. Sleep 2025, 49: zsaf342. PMID: 41159689, DOI: 10.1093/sleep/zsaf342.Peer-Reviewed Original ResearchCitationsConceptsPositive airway pressureObstructive sleep apneaPositive airway pressure useRandomized trialsSleep apneaPAP useBetween-group differencesManagement of obstructive sleep apneaPositive airway pressure therapyAirway pressure therapyControl groupPilot Randomized TrialSite-randomized trialBetween-groupAirway pressurePulse oximetry dataSleep centerVeterans Affairs Medical CenterPressure therapyAffairs Medical CenterPrimary outcomeDepartment of Veterans Affairs Medical CenterOximetry dataSingle-blindImmediate group
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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Yale School of Medicine
Section of General Internal Medicine, 100 Church Street South
New Haven, CT 06519
United States