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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 73 19529 18325 9720 8965 206 36185

Ronald G. Thomas publications per year

The chart shows the history of publications by Ronald G. Thomas between 1979 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Ronald G. Thomas published across 47 years, from 1979 to 2025, averaging 5.5 papers a year. Output peaked at 19 publications in 2023. 18 of the 257 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1979 to 2025. Vertical axis: number of publications, 0 to 19. Peak 19 publications in 2023. 1979: 1 publication 1980: 0 publications 1981: 0 publications 1982: 0 publications 1983: 0 publications 1984: 0 publications 1985: 0 publications 1986: 0 publications 1987: 0 publications 1988: 3 publications 1989: 1 publication 1990: 1 publication 1991: 1 publication 1992: 1 publication 1993: 1 publication 1994: 1 publication 1995: 1 publication 1996: 6 publications 1997: 10 publications 1998: 8 publications 1999: 5 publications 2000: 9 publications 2001: 1 publication 2002: 8 publications 2003: 7 publications 2004: 7 publications 2005: 9 publications 2006: 1 publication 2007: 7 publications 2008: 11 publications 2009: 9 publications 2010: 5 publications 2011: 6 publications 2012: 10 publications 2013: 11 publications 2014: 8 publications 2015: 7 publications 2016: 8 publications 2017: 7 publications 2018: 5 publications 2019: 12 publications 2020: 11 publications 2021: 8 publications 2022: 13 publications 2023: 19 publications 2024: 11 publications 2025: 7 publications
1979 2025

257 publications in total across all disciplines

View publications per year as a table
Ronald G. Thomas: publications per year, 1979 to 2025
Year Publications
1979 1
1980 0
1981 0
1982 0
1983 0
1984 0
1985 0
1986 0
1987 0
1988 3
1989 1
1990 1
1991 1
1992 1
1993 1
1994 1
1995 1
1996 6
1997 10
1998 8
1999 5
2000 9
2001 1
2002 8
2003 7
2004 7
2005 9
2006 1
2007 7
2008 11
2009 9
2010 5
2011 6
2012 10
2013 11
2014 8
2015 7
2016 8
2017 7
2018 5
2019 12
2020 11
2021 8
2022 13
2023 19
2024 11
2025 7
Total 257
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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.

No. of scientists
200 400 600 800
Bar chart with 86 bars. Horizontal axis: publications, 101–120 to 1,796+. Vertical axis: number of scientists, 0 to 922. Most scientists, 922, have 341–360 publications. The last bar groups every scientist with 1,796 publications or more. The highlighted bar, 201–220 publications, is where this scientist sits. 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: 610 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
101–120 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.

View publications distribution as a table
Number of Medicine scientists by publication count, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
Publications Scientists This scientist
101–120 5
121–140 26
141–160 73
161–180 155
181–200 230
201–220 363 206
221–240 487
241–260 545
261–280 722
281–300 768
301–320 834
321–340 895
341–360 922
361–380 838
381–400 861
401–420 918
421–440 806
441–460 771
461–480 751
481–500 713
501–520 617
521–540 610
541–560 537
561–580 504
581–600 509
601–620 396
621–640 386
641–660 371
661–680 340
681–700 336
701–720 307
721–740 259
741–760 230
761–780 228
781–800 217
801–820 204
821–840 186
841–860 177
861–880 155
881–900 139
901–920 145
921–940 116
941–960 133
961–980 91
981–1,000 96
1,001–1,020 77
1,021–1,040 70
1,041–1,060 63
1,061–1,080 77
1,081–1,100 49
1,101–1,120 54
1,121–1,140 49
1,141–1,160 51
1,161–1,180 35
1,181–1,200 39
1,201–1,220 26
1,221–1,240 37
1,241–1,260 36
1,261–1,280 27
1,281–1,300 32
1,301–1,320 28
1,321–1,340 17
1,341–1,360 30
1,361–1,380 28
1,381–1,400 17
1,401–1,420 21
1,421–1,440 15
1,441–1,460 12
1,461–1,480 12
1,481–1,500 18
1,501–1,520 14
1,521–1,540 17
1,541–1,560 15
1,561–1,580 6
1,581–1,600 2
1,601–1,620 12
1,621–1,640 11
1,641–1,660 8
1,661–1,680 5
1,681–1,700 5
1,701–1,720 10
1,721–1,740 12
1,741–1,760 14
1,761–1,780 6
1,781–1,795 5
1,796+ 100
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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.

No. of scientists
250 500 750 1,000
Bar chart with 75 bars. Horizontal axis: D-Index, 70–71 to 217+. Vertical axis: number of scientists, 0 to 1,027. Most scientists, 1,027, have 82–83 D-Index. The last bar groups every scientist with 217 D-Index or more. The highlighted bar, 72–73 D-Index, is where this scientist sits. 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: 399 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
70–71 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.

View D-Index distribution as a table
Number of Medicine scientists by D-index, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
D-Index Scientists This scientist
70–71 226
72–73 391 73
74–75 574
76–77 730
78–79 891
80–81 972
82–83 1,027
84–85 1,003
86–87 960
88–89 970
90–91 922
92–93 839
94–95 808
96–97 779
98–99 668
100–101 611
102–103 630
104–105 513
106–107 541
108–109 445
110–111 429
112–113 399
114–115 393
116–117 318
118–119 302
120–121 287
122–123 255
124–125 256
126–127 252
128–129 230
130–131 179
132–133 168
134–135 163
136–137 159
138–139 134
140–141 134
142–143 118
144–145 109
146–147 106
148–149 74
150–151 79
152–153 80
154–155 87
156–157 57
158–159 74
160–161 69
162–163 60
164–165 53
166–167 39
168–169 42
170–171 32
172–173 39
174–175 40
176–177 28
178–179 19
180–181 23
182–183 31
184–185 18
186–187 20
188–189 22
190–191 13
192–193 21
194–195 12
196–197 12
198–199 14
200–201 15
202–203 13
204–205 10
206–207 8
208–209 4
210–211 12
212–213 11
214–215 10
216 4
217+ 98
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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)
Clifford R. Jack
Clifford R. Jack Mayo Clinic
Douglas Galasko
Douglas Galasko University of California, San Diego

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