World's Best Scientists 2026 revealed!
VIEW LIST
Ronald G. Thomas

D-Index & Metrics

Medicine

D-Index
73
Citations
36185
World Ranking
19530
National Ranking
9723

Ronald G. Thomas publication distribution in Medicine in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Medicine in 2026. The highlighted bar marks where Ronald G. Thomas sits on this spectrum.

101–120 publications: 5 scientists 121–140 publications: 26 scientists 141–160 publications: 73 scientists 161–180 publications: 155 scientists 181–200 publications: 230 scientists 201–220 publications: 363 scientists 221–240 publications: 487 scientists 241–260 publications: 545 scientists 261–280 publications: 722 scientists 281–300 publications: 768 scientists 301–320 publications: 834 scientists 321–340 publications: 895 scientists 341–360 publications: 922 scientists 361–380 publications: 838 scientists 381–400 publications: 861 scientists 401–420 publications: 918 scientists 421–440 publications: 806 scientists 441–460 publications: 771 scientists 461–480 publications: 751 scientists 481–500 publications: 713 scientists 501–520 publications: 617 scientists 521–540 publications: 611 scientists 541–560 publications: 537 scientists 561–580 publications: 504 scientists 581–600 publications: 509 scientists 601–620 publications: 396 scientists 621–640 publications: 386 scientists 641–660 publications: 371 scientists 661–680 publications: 340 scientists 681–700 publications: 336 scientists 701–720 publications: 307 scientists 721–740 publications: 259 scientists 741–760 publications: 230 scientists 761–780 publications: 228 scientists 781–800 publications: 217 scientists 801–820 publications: 204 scientists 821–840 publications: 186 scientists 841–860 publications: 177 scientists 861–880 publications: 155 scientists 881–900 publications: 139 scientists 901–920 publications: 145 scientists 921–940 publications: 116 scientists 941–960 publications: 133 scientists 961–980 publications: 91 scientists 981–1,000 publications: 96 scientists 1,001–1,020 publications: 77 scientists 1,021–1,040 publications: 70 scientists 1,041–1,060 publications: 63 scientists 1,061–1,080 publications: 77 scientists 1,081–1,100 publications: 49 scientists 1,101–1,120 publications: 54 scientists 1,121–1,140 publications: 49 scientists 1,141–1,160 publications: 51 scientists 1,161–1,180 publications: 35 scientists 1,181–1,200 publications: 39 scientists 1,201–1,220 publications: 26 scientists 1,221–1,240 publications: 37 scientists 1,241–1,260 publications: 36 scientists 1,261–1,280 publications: 27 scientists 1,281–1,300 publications: 32 scientists 1,301–1,320 publications: 28 scientists 1,321–1,340 publications: 17 scientists 1,341–1,360 publications: 30 scientists 1,361–1,380 publications: 28 scientists 1,381–1,400 publications: 17 scientists 1,401–1,420 publications: 21 scientists 1,421–1,440 publications: 15 scientists 1,441–1,460 publications: 12 scientists 1,461–1,480 publications: 12 scientists 1,481–1,500 publications: 18 scientists 1,501–1,520 publications: 14 scientists 1,521–1,540 publications: 17 scientists 1,541–1,560 publications: 15 scientists 1,561–1,580 publications: 6 scientists 1,581–1,600 publications: 2 scientists 1,601–1,620 publications: 12 scientists 1,621–1,640 publications: 11 scientists 1,641–1,660 publications: 8 scientists 1,661–1,680 publications: 5 scientists 1,681–1,700 publications: 5 scientists 1,701–1,720 publications: 10 scientists 1,721–1,740 publications: 12 scientists 1,741–1,760 publications: 14 scientists 1,761–1,780 publications: 6 scientists 1,781–1,795 publications: 5 scientists 1,796+ publications: 100 scientists
101 publications 1,796+

This scientist: 206 publications — 3rd percentile

3% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,796 publications or more.

Ronald G. Thomas D-index placement in Medicine in 2026

The chart shows the D-index (discipline H-index) distribution of Medicine scientists ranked by Research.com in 2026. The highlighted bar marks where Ronald G. Thomas sits on this spectrum.

70–71 D-Index: 226 scientists 72–73 D-Index: 391 scientists 74–75 D-Index: 574 scientists 76–77 D-Index: 730 scientists 78–79 D-Index: 891 scientists 80–81 D-Index: 972 scientists 82–83 D-Index: 1,027 scientists 84–85 D-Index: 1,003 scientists 86–87 D-Index: 960 scientists 88–89 D-Index: 970 scientists 90–91 D-Index: 922 scientists 92–93 D-Index: 839 scientists 94–95 D-Index: 808 scientists 96–97 D-Index: 779 scientists 98–99 D-Index: 668 scientists 100–101 D-Index: 611 scientists 102–103 D-Index: 630 scientists 104–105 D-Index: 513 scientists 106–107 D-Index: 541 scientists 108–109 D-Index: 445 scientists 110–111 D-Index: 429 scientists 112–113 D-Index: 400 scientists 114–115 D-Index: 393 scientists 116–117 D-Index: 318 scientists 118–119 D-Index: 302 scientists 120–121 D-Index: 287 scientists 122–123 D-Index: 255 scientists 124–125 D-Index: 256 scientists 126–127 D-Index: 252 scientists 128–129 D-Index: 230 scientists 130–131 D-Index: 179 scientists 132–133 D-Index: 168 scientists 134–135 D-Index: 163 scientists 136–137 D-Index: 159 scientists 138–139 D-Index: 134 scientists 140–141 D-Index: 134 scientists 142–143 D-Index: 118 scientists 144–145 D-Index: 109 scientists 146–147 D-Index: 106 scientists 148–149 D-Index: 74 scientists 150–151 D-Index: 79 scientists 152–153 D-Index: 80 scientists 154–155 D-Index: 87 scientists 156–157 D-Index: 57 scientists 158–159 D-Index: 74 scientists 160–161 D-Index: 69 scientists 162–163 D-Index: 60 scientists 164–165 D-Index: 53 scientists 166–167 D-Index: 39 scientists 168–169 D-Index: 42 scientists 170–171 D-Index: 32 scientists 172–173 D-Index: 39 scientists 174–175 D-Index: 40 scientists 176–177 D-Index: 28 scientists 178–179 D-Index: 19 scientists 180–181 D-Index: 23 scientists 182–183 D-Index: 31 scientists 184–185 D-Index: 18 scientists 186–187 D-Index: 20 scientists 188–189 D-Index: 22 scientists 190–191 D-Index: 13 scientists 192–193 D-Index: 21 scientists 194–195 D-Index: 12 scientists 196–197 D-Index: 12 scientists 198–199 D-Index: 14 scientists 200–201 D-Index: 15 scientists 202–203 D-Index: 13 scientists 204–205 D-Index: 10 scientists 206–207 D-Index: 8 scientists 208–209 D-Index: 4 scientists 210–211 D-Index: 12 scientists 212–213 D-Index: 11 scientists 214–215 D-Index: 10 scientists 216 D-Index: 4 scientists 217+ D-Index: 98 scientists
70 D-Index 217+

This scientist: 73 D-Index — 3rd percentile

3% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 217 D-Index or more.

Research.com Recognitions

  • 1997 - Fellow of the American Association for the Advancement of Science (AAAS)

Overview

Ronald G. Thomas is affiliated with the University of California, San Diego in the United States. Their research focuses broadly within the field of Medicine, with multiple contributions to Psychiatry and Mental Health, Physiology, Cognitive Neuroscience, Neurology, and Radiology, Nuclear Medicine, and Imaging.

The scientist's work covers a range of main topics including:

  • Dementia and Cognitive Impairment Research
  • Alzheimer's disease research and treatments
  • Functional Brain Connectivity Studies
  • Advanced Neuroimaging Techniques and Applications
  • Frailty in Older Adults
  • Sleep and related disorders
  • Cholinesterase and Neurodegenerative Diseases

Notable recent papers featuring Ronald G. Thomas include:

  • Spread of pathological tau proteins through communicating neurons in human Alzheimer's disease (2020, Nature Communications)
  • A trial of gantenerumab or solanezumab in dominantly inherited Alzheimer's disease (2021, Nature Medicine)
  • Functional brain architecture is associated with the rate of tau accumulation in Alzheimer's disease (2020, Nature Communications)
  • In vivo staging of regional amyloid deposition (2022, Columbia Academic Commons - Columbia University)
  • Characterizing Heterogeneity in Neuroimaging, Cognition, Clinical Symptoms, and Genetics Among Patients With Late-Life Depression (2022, JAMA Psychiatry)

Frequent co-authors collaborating with Ronald G. Thomas include:

  • John C. Morris
  • Eric M. Reiman
  • Michael Donohue
  • Kewei Chen
  • Erin Householder

The scientist has published regularly in various venues. The most frequent publication outlets are:

  • Alzheimer's & Dementia
  • Scientific Reports
  • Nature Communications
  • GeroScience
  • bioRxiv (Cold Spring Harbor Laboratory)

Ronald G. Thomas has received recognition as a Fellow of the American Association for the Advancement of Science (AAAS), awarded in 1997.

Best Publications

  • A controlled trial of selegiline, alpha-tocopherol, or both as treatment for Alzheimer's disease. The Alzheimer's Disease Cooperative Study

    Mary Sano;Christopher Ernesto;Ronald G. Thomas;Melville R. Klauber

  • Vitamin E and Donepezil for the Treatment of Mild Cognitive Impairment

    Ronald C. Petersen;Ronald G. Thomas;Michael Grundman;David Bennett

  • Phase 3 Trials of Solanezumab for Mild-to-Moderate Alzheimer's Disease

    RS Rachelle S. Doody;RG Ronald G. Rg Thomas;Martin Farlow;Takeshi Iwatsubo

  • Length of clinical trials of dementia drugs : Position paper from the international working group on harmonization of dementia drug guidelines

    Douglas Galasko;David Bennett;Mary Sano;Chris Ernesto

  • A Phase 3 Trial of Semagacestat for Treatment of Alzheimer's Disease

    Rachelle S. Doody;Rema Raman;Martin Farlow;Takeshi Iwatsubo

  • Estrogen Replacement Therapy for Treatment of Mild to Moderate Alzheimer Disease: A Randomized Controlled Trial

    R. A. Mulnard;C. W. Cotman;C. Kawas;C. H. Van Dyck

  • Mild cognitive impairment can be distinguished from Alzheimer disease and normal aging for clinical trials.

    Michael Grundman;Ronald C. Petersen;Steven H. Ferris;Ronald G. Thomas

  • Effects of Rofecoxib or Naproxen vs Placebo on Alzheimer Disease Progression: A Randomized Controlled Trial

    Paul S. Aisen;Kimberly A. Schafer;Michael Grundman;Eric Pfeiffer

  • Early role of vascular dysregulation on late-onset Alzheimer’s disease based on multifactorial data-driven analysis

    Y. Iturria-Medina;R. C. Sotero;P. J. Toussaint;J. M. Mateos-Pérez

  • Docosahexaenoic acid supplementation and cognitive decline in Alzheimer disease: a randomized trial.

    Joseph F. Quinn;Rema Raman;Ronald G. Thomas;Karin Yurko-Mauro

  • Angiographic and clinical predictors of acute closure after native vessel coronary angioplasty

    Stephen Ellis;G. S. Roubin;S. B. King;J. S. Douglas

  • The Preclinical Alzheimer Cognitive Composite Measuring Amyloid-Related Decline

    Michael C. Donohue;Reisa A. Sperling;David P. Salmon;Dorene M. Rentz

  • Reduction of Nightmares and Other PTSD Symptoms in Combat Veterans by Prazosin: A Placebo-Controlled Study

    Murray A. Raskind;Elaine R. Peskind;Evan D. Kanter;Eric C. Petrie

  • A randomized, double-blind, placebo-controlled trial of resveratrol for Alzheimer disease

    R. Scott Turner;Ronald G. Thomas;Suzanne Craft;Christopher H. van Dyck

  • Effect of dimebon on cognition, activities of daily living, behaviour, and global function in patients with mild-to-moderate Alzheimer's disease: a randomised, double-blind, placebo-controlled study

    Rachelle S Doody;Svetlana I Gavrilova;Mary Sano;Ronald G Thomas

  • Validity and reliability of the Alzheimer's Disease Cooperative Study–Clinical Global Impression of Change.

    Lon S. Schneider;Jason T. Olin;Rachelle S. Doody;Christopher M. Clark

  • High-Dose B Vitamin Supplementation and Cognitive Decline in Alzheimer Disease: A Randomized Controlled Trial

    Paul S. Aisen;Lon S. Schneider;Mary Sano;Ramon Diaz-Arrastia

  • The psychosocial impact of macular degeneration.

    Rebecca A. Williams;Barbara L. Brody;Ronald G. Thomas;Robert M. Kaplan

  • A randomized controlled trial of prednisone in Alzheimer’s disease

    Paul S. Aisen;K. L. Davis;J. D. Berg;K. Schafer

  • High Cerebrospinal Fluid Tau and Low Amyloid β42 Levels in the Clinical Diagnosis of Alzheimer Disease and Relation to Apolipoprotein E Genotype

    D. Galasko;L. Chang;R. Motter;C. M. Clark

Frequent Co-Authors

Paul S. Aisen
Paul S. Aisen University of Southern California
Mary Sano
Mary Sano Icahn School of Medicine at Mount Sinai
Lon S. Schneider
Lon S. Schneider University of Southern California
Pierre N. Tariot
Pierre N. Tariot University of Rochester
Leon J. Thal
Leon J. Thal University of California, San Diego
Ronald C. Petersen
Ronald C. Petersen University of Pennsylvania
Rachelle S. Doody
Rachelle S. Doody Roche (Switzerland)
Christopher H. van Dyck
Christopher H. van Dyck Yale University
Clifford R. Jack
Clifford R. Jack Mayo Clinic
Douglas Galasko
Douglas Galasko University of California, San Diego

If you think any of the details on this page are incorrect, let us know.

Report an issue

We appreciate your kind effort to assist us to improve this page, it would be helpful providing us with as much detail as possible in the text box below:

Related Online Degrees & Career Pathways

Exploring medicine in the USA opens doors to various online degrees and fast-tracked career options in healthcare. For nursing professionals looking to advance quickly, there are shortest dnp programs online designed to help you earn your Doctor of Nursing Practice degree efficiently, without compromising on quality.

If you’re seeking alternatives rated by ease and duration, explore the shortest dnp program choices, which have streamlined courses and flexible formats to suit working nurses. Those beginning their nursing journey can benefit from fast track lpn programs online, which allow students to achieve their Licensed Practical Nurse credentials at an accelerated pace.

For those interested in mental health, specialized options like psych np online programs make it possible to earn a Master of Science in Nursing degree with a focus on psychiatric care more quickly than traditional programs. These online pathways offer flexibility, efficiency, and a direct route into high-demand medical careers.

Best Scientists Citing Ronald G. Thomas

Kaj Blennow

Kaj Blennow

University of Gothenburg

Publications: 169

Paul S. Aisen

Paul S. Aisen

University of Southern California

Publications: 156

Jeffrey L. Cummings

Jeffrey L. Cummings

University of Nevada, Las Vegas

Publications: 134

Reisa A. Sperling

Reisa A. Sperling

Brigham and Women's Hospital

Publications: 117

Lon S. Schneider

Lon S. Schneider

University of Southern California

Publications: 114

Bruno Vellas

Bruno Vellas

Federal University of Toulouse Midi-Pyrénées

Publications: 113

Ronald C. Petersen

Ronald C. Petersen

University of Pennsylvania

Publications: 106

Henrik Zetterberg

Henrik Zetterberg

University of Gothenburg

Publications: 99

John P. Pierce

John P. Pierce

University of California, San Diego

Publications: 98

Serge Gauthier

Serge Gauthier

McGill University

Publications: 92

Harald Hampel

Harald Hampel

Eisai (United States)

Publications: 86

John C. Morris

John C. Morris

Washington University in St. Louis

Publications: 85

Mark W. Bondi

Mark W. Bondi

University of California, San Diego

Publications: 76

Mary Sano

Mary Sano

Icahn School of Medicine at Mount Sinai

Publications: 73

Ralph N. Martins

Ralph N. Martins

Edith Cowan University

Publications: 72

Philip Scheltens

Philip Scheltens

Amsterdam UMC

Publications: 71

Trending Scientists

Qinghai Song

Qinghai Song

Harbin Institute of Technology

S. M. Rutter

S. M. Rutter

Harper Adams University

Shah Fahad

Shah Fahad

University of Swabi

William J. Manning

William J. Manning

University of Massachusetts Amherst

Judy Dunn

Judy Dunn

King's College London

Arthur H. Chappelka

Arthur H. Chappelka

Auburn University

Neal S. Peachey

Neal S. Peachey

Cleveland Clinic

Peter J. Mucha

Peter J. Mucha

Dartmouth College

Li-Rong Dai

Li-Rong Dai

University of Science and Technology of China

Yun Xiang

Yun Xiang

Southwest University

Jiří Barek

Jiří Barek

Charles University

Frank Rominger

Frank Rominger

Heidelberg University

John D. B. Featherstone

John D. B. Featherstone

University of California, San Francisco

Paul L. Angermeier

Paul L. Angermeier

Virginia Tech

Hugh V. Danks

Hugh V. Danks

Okayama University

Etienne K. Klein

Etienne K. Klein

INRAE : Institut national de recherche pour l'agriculture, l'alimentation et l'environnement

Related Medicine Rankings & Guides

2026 Easiest DNP Programs

2026 Easiest DNP Programs
2026 Most Affordable Online DNP Programs

2026 Most Affordable Online DNP Programs
2026 Best Occupational Therapy Programs

2026 Best Occupational Therapy Programs
2026 Best Nurse Practitioner Programs in Florida – Accredited Schools Online & Campus

2026 Best Nurse Practitioner Programs in Florida – Accredited Schools Online & Campus
2026 Best Nurse Practitioner Programs in Connecticut – Accredited Schools Online & Campus

2026 Best Nurse Practitioner Programs in Connecticut – Accredited Schools Online & Campus
2026 Most Affordable CNA to RN Online Bridge Programs

2026 Most Affordable CNA to RN Online Bridge Programs
2026 Easiest Nurse Midwife Programs to Get Into

2026 Easiest Nurse Midwife Programs to Get Into
2026 Best Online Nursing Programs in Ohio – Accredited RN to BSN Programs

2026 Best Online Nursing Programs in Ohio – Accredited RN to BSN Programs
2026 Best Online Nursing Programs in California: Accredited RN to BSN Programs

2026 Best Online Nursing Programs in California: Accredited RN to BSN Programs
2026 Fastest Online MSN in Forensic Nursing Programs

2026 Fastest Online MSN in Forensic Nursing Programs
2026 Best Online DNP Programs Without Clinicals

2026 Best Online DNP Programs Without Clinicals
2026 Healthcare Degree Programs You Can Earn in 2 Years or Less

2026 Healthcare Degree Programs You Can Earn in 2 Years or Less
2026 Best Nurse Practitioner Programs in Utah – Accredited Schools Online & Campus

2026 Best Nurse Practitioner Programs in Utah – Accredited Schools Online & Campus
2026 Is Grand Canyon University School of Nursing Worth It?

2026 Is Grand Canyon University School of Nursing Worth It?
2026 Best Online Associate Science in Nursing (ASN) Programs

2026 Best Online Associate Science in Nursing (ASN) Programs
2026 Best Online Surgical Tech Certificate Programs

2026 Best Online Surgical Tech Certificate Programs
2026 Most Affordable Online AGNP Programs

2026 Most Affordable Online AGNP Programs
2026 Most Affordable Online BSN to MSN Bridge Programs

2026 Most Affordable Online BSN to MSN Bridge Programs
2026 Best Nurse Practitioner Programs in New Jersey – Accredited Schools Online & Campus

2026 Best Nurse Practitioner Programs in New Jersey – Accredited Schools Online & Campus
2026 Best Nurse Practitioner Programs in South Carolina – Accredited Schools Online & Campus

2026 Best Nurse Practitioner Programs in South Carolina – Accredited Schools Online & Campus
2026 Most Affordable Online Dental Assistant to Dental Hygienist Bridge Programs

2026 Most Affordable Online Dental Assistant to Dental Hygienist Bridge Programs

Recently Published Articles

2026 How to Become a Caregiver: Certification Requirements in Georgia

2026 How to Become a Caregiver: Certification Requirements in Georgia
2026 Best Online Medical & Healthcare Certificate Programs

2026 Best Online Medical & Healthcare Certificate Programs
2026 Fastest Online Creative Writing Bachelor's Degree Programs You Can Finish in 3 Years or Less

2026 Fastest Online Creative Writing Bachelor's Degree Programs You Can Finish in 3 Years or Less
2026 Military-Friendly Online Neuroscience Bachelor's Degree Programs

2026 Military-Friendly Online Neuroscience Bachelor's Degree Programs
2026 How to Become an Accountant in New Jersey

2026 How to Become an Accountant in New Jersey
2026 Best Online Physics Degree Programs

2026 Best Online Physics Degree Programs
2026 How to Become a BCBA in Charlotte, NC: Education Requirements & Certification

2026 How to Become a BCBA in Charlotte, NC: Education Requirements & Certification
2026 How to Become a Substance Abuse Counselor in Missouri

2026 How to Become a Substance Abuse Counselor in Missouri
2026 Online Criminal Justice Bachelor's Degree Programs That Accept Transfer Credits

2026 Online Criminal Justice Bachelor's Degree Programs That Accept Transfer Credits
2026 Accounting Degree vs. Certificate: Which Should You Choose?

2026 Accounting Degree vs. Certificate: Which Should You Choose?
2026 10 Best Accredited Medical Billing and Coding Schools Online

2026 10 Best Accredited Medical Billing and Coding Schools Online
2026 Cheapest Online Organizational Leadership Bachelor's Degrees That Pay Well: Tuition, Duration, and Earnings

2026 Cheapest Online Organizational Leadership Bachelor's Degrees That Pay Well: Tuition, Duration, and Earnings
2026 Financial Aid for Online Applied Behavior Analysis Bachelor's Degrees: FAFSA, Grants, and Scholarships

2026 Financial Aid for Online Applied Behavior Analysis Bachelor's Degrees: FAFSA, Grants, and Scholarships
2026 Cheapest and Shortest Online Cybersecurity Degree Programs That Pay Well: Cost, Duration, and Salary Outlook

2026 Cheapest and Shortest Online Cybersecurity Degree Programs That Pay Well: Cost, Duration, and Salary Outlook
2026 Military-Friendly Online Adult Gerontology Acute Care Nurse Practitioner Master's Degree Programs: Benefits, Accreditation & Career Outcomes

2026 Military-Friendly Online Adult Gerontology Acute Care Nurse Practitioner Master's Degree Programs: Benefits, Accreditation & Career Outcomes
2026 How to Become a Pharmacy Technician

2026 How to Become a Pharmacy Technician
2026 Best Online Dual Master’s Degrees

2026 Best Online Dual Master’s Degrees
2026 How to Become a Special Education Teacher in Massachusetts: Requirements & Certification

2026 How to Become a Special Education Teacher in Massachusetts: Requirements & Certification
2026 Fastest Online Urban Planning Degree Programs You Can Finish in Under 2 Years

2026 Fastest Online Urban Planning Degree Programs You Can Finish in Under 2 Years
2026 Military-Friendly Online Nutrition Degree Programs: Benefits, Accreditation, and Career Outcomes

2026 Military-Friendly Online Nutrition Degree Programs: Benefits, Accreditation, and Career Outcomes
2026 How Long Does It Take to Earn an Online Clinical Mental Health Counseling Master's Degree? Program Timelines & Completion Options

2026 How Long Does It Take to Earn an Online Clinical Mental Health Counseling Master's Degree? Program Timelines & Completion Options