World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 77 18468 17352 9207 8507 255 20885

George N. Ioannou publications per year

The chart shows the history of publications by George N. Ioannou between 2001 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. George N. Ioannou published across 25 years, from 2001 to 2025, averaging 14.7 papers a year. Output peaked at 54 publications in 2023. 78 of the 367 publications appeared in the last two years.

No. of publications
10 20 30 40 50
Bar chart. Horizontal axis: year, 2001 to 2025. Vertical axis: number of publications, 0 to 54. Peak 54 publications in 2023. 2001: 3 publications 2002: 6 publications 2003: 12 publications 2004: 2 publications 2005: 5 publications 2006: 8 publications 2007: 7 publications 2008: 7 publications 2009: 3 publications 2010: 5 publications 2011: 7 publications 2012: 4 publications 2013: 12 publications 2014: 3 publications 2015: 13 publications 2016: 13 publications 2017: 16 publications 2018: 12 publications 2019: 26 publications 2020: 23 publications 2021: 25 publications 2022: 23 publications 2023: 54 publications 2024: 42 publications 2025: 36 publications
2001 2025

367 publications in total across all disciplines

View publications per year as a table
George N. Ioannou: publications per year, 2001 to 2025
Year Publications
2001 3
2002 6
2003 12
2004 2
2005 5
2006 8
2007 7
2008 7
2009 3
2010 5
2011 7
2012 4
2013 12
2014 3
2015 13
2016 13
2017 16
2018 12
2019 26
2020 23
2021 25
2022 23
2023 54
2024 42
2025 36
Total 367
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George N. Ioannou 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 George N. Ioannou 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, 241–260 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: 255 publications — 9th percentile

9% 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
221–240 487
241–260 545 255
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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George N. Ioannou 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 George N. Ioannou 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, 76–77 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: 77 D-Index — 10th percentile

10% 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
74–75 574
76–77 730 77
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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Overview

What is he best known for?

The fields of study he is best known for:

  • Internal medicine
  • Cancer
  • Surgery

George N. Ioannou mostly deals with Internal medicine, Endocrinology, Gastroenterology, Cirrhosis and Nonalcoholic fatty liver disease. His research on Internal medicine frequently links to adjacent areas such as National Health and Nutrition Examination Survey. His Endocrinology study incorporates themes from Nephrology and Steatohepatitis.

In his research on the topic of Gastroenterology, Iron deficiency, Anemia, Iron-deficiency anemia, Alcohol consumption and Alcohol is strongly related with Odds ratio. His Nonalcoholic fatty liver disease research is multidisciplinary, relying on both Autoimmune hepatitis, Primary sclerosing cholangitis and Lipotoxicity. His Hepatocellular carcinoma study which covers Immunology that intersects with Liver cancer and Veterans Affairs.

His most cited work include:

  • Circulating microRNAs in patients with chronic hepatitis C and non-alcoholic fatty liver disease. (412 citations)
  • NLRP3 inflammasome blockade reduces liver inflammation and fibrosis in experimental NASH in mice. (298 citations)
  • Predictors of colorectal cancer screening participation in the United States. (254 citations)

What are the main themes of his work throughout his whole career to date?

Internal medicine, Cirrhosis, Gastroenterology, Hepatocellular carcinoma and Hepatitis C are his primary areas of study. The concepts of his Internal medicine study are interwoven with issues in Endocrinology and Oncology. As a part of the same scientific study, George N. Ioannou usually deals with the Cirrhosis, concentrating on Model for End-Stage Liver Disease and frequently concerns with Intensive care medicine.

His Gastroenterology research integrates issues from Surgery, Transplantation, National Health and Nutrition Examination Survey and Iron-deficiency anemia. His Hepatocellular carcinoma research includes themes of Liver transplantation and Hepatitis C virus. George N. Ioannou combines subjects such as Ledipasvir and Sofosbuvir with his study of Hepatitis C.

He most often published in these fields:

  • Internal medicine (121.20%)
  • Cirrhosis (51.60%)
  • Gastroenterology (42.40%)

What were the highlights of his more recent work (between 2018-2021)?

  • Internal medicine (121.20%)
  • Cirrhosis (51.60%)
  • Hepatocellular carcinoma (45.20%)

In recent papers he was focusing on the following fields of study:

His primary areas of study are Internal medicine, Cirrhosis, Hepatocellular carcinoma, Oncology and Veterans Affairs. His studies examine the connections between Internal medicine and genetics, as well as such issues in Gastroenterology, with regards to Nightmare. His Cirrhosis research incorporates elements of Liver disease, Model for End-Stage Liver Disease, Intensive care medicine and Receiver operating characteristic.

His biological study deals with issues like Hepatitis C virus, which deal with fields such as Interferon and Hepatitis B virus. His work carried out in the field of Oncology brings together such families of science as Chronic hepatitis, Antiviral treatment and Virologic response. In his work, Dialysis, Intensive care unit and Azithromycin is strongly intertwined with Mechanical ventilation, which is a subfield of Veterans Affairs.

Between 2018 and 2021, his most popular works were:

  • Increased Risk for Hepatocellular Carcinoma Persists Up to 10 Years After HCV Eradication in Patients With Baseline Cirrhosis or High FIB-4 Scores (74 citations)
  • Increased Risk for Hepatocellular Carcinoma Persists Up to 10 Years After HCV Eradication in Patients With Baseline Cirrhosis or High FIB-4 Scores (74 citations)
  • What Are the Benefits of a Sustained Virologic Response to Direct-Acting Antiviral Therapy for Hepatitis C Virus Infection? (74 citations)

In his most recent research, the most cited papers focused on:

  • Internal medicine
  • Cancer
  • Surgery

His primary areas of investigation include Internal medicine, Cirrhosis, Hepatocellular carcinoma, Hazard ratio and Liver disease. Veterans Affairs, Hepatitis C, Incidence, Abdominal surgery and Retrospective cohort study are the core of his Internal medicine study. His Cirrhosis study is related to the wider topic of Gastroenterology.

His Hepatocellular carcinoma study combines topics in areas such as Antiviral therapy, Direct acting, Oncology and Hepatitis C virus. His research investigates the connection between Hazard ratio and topics such as Cohort study that intersect with issues in Cause of death, Comorbidity, Rate ratio and Radiation therapy. The Liver disease study combines topics in areas such as Odds ratio, Ascites, Chronic liver disease, Blood transfusion and Elective surgery.

Best Publications

  • NLRP3 inflammasome blockade reduces liver inflammation and fibrosis in experimental NASH in mice.

    Auvro R. Mridha;Alexander Wree;Alexander Wree;Avril A.B. Robertson;Matthew M. Yeh

  • Circulating microRNAs in patients with chronic hepatitis C and non-alcoholic fatty liver disease.

    Silvia Cermelli;Anna Ruggieri;Anna Ruggieri;Jorge A. Marrero;George N. Ioannou

  • Terlipressin for acute esophageal variceal hemorrhage

    George N Ioannou;Jenny Doust;Don C Rockey

  • HCV eradication induced by direct-acting antiviral agents reduces the risk of hepatocellular carcinoma.

    George N. Ioannou;George N. Ioannou;Pamela K. Green;Kristin Berry

  • Trends in Burden of Cirrhosis and Hepatocellular Carcinoma by Underlying Liver Disease in US Veterans, 2001–2013

    Lauren A. Beste;Steven L. Leipertz;Pamela K. Green;Jason A. Dominitz

  • The Role of Cholesterol in the Pathogenesis of NASH

    George N. Ioannou

  • The prevalence and predictors of elevated serum aminotransferase activity in the United States in 1999-2002.

    George N Ioannou;Edward J Boyko;Sum P Lee

  • Hepatic Free Cholesterol Accumulates in Obese, Diabetic Mice and Causes Nonalcoholic Steatohepatitis

    Derrick M. Van Rooyen;Claire Z. Larter;W. Geoffrey Haigh;Matthew M. Yeh

  • Incidence and Predictors of Hepatocellular Carcinoma in Patients With Cirrhosis

    George N. Ioannou;Meaghan F. Splan;Noel S. Weiss;George B. McDonald;George B. McDonald

  • 25-Hydroxyvitamin D Levels and Albuminuria in the Third National Health and Nutrition Examination Survey (NHANES III)

    Ian H. de Boer;George N. Ioannou;Bryan Kestenbaum;John D. Brunzell

  • Predictors of colorectal cancer screening participation in the United States.

    George N Ioannou;George N Ioannou;Michael K Chapko;Michael K Chapko;Jason A Dominitz;Jason A Dominitz

  • Association between Gestational Diabetes and Pregnancy-induced Hypertension

    Chris L. Bryson;George N. Ioannou;Stephen J. Rulyak;Cathy Critchlow

  • Increased Risk for Hepatocellular Carcinoma Persists Up to 10 Years After HCV Eradication in Patients With Baseline Cirrhosis or High FIB-4 Scores

    George N. Ioannou;George N. Ioannou;Lauren A. Beste;Pamela K. Green;Amit G. Singal

  • Risk Factors for Hospitalization, Mechanical Ventilation, or Death Among 10 131 US Veterans With SARS-CoV-2 Infection.

    George N. Ioannou;Emily Locke;Pamela Green;Kristin Berry

  • Liver transplantation for hepatocellular carcinoma: impact of the MELD allocation system and predictors of survival.

    George N. Ioannou;George N. Ioannou;James D. Perkins;Robert L. Carithers

  • Elevated serum alanine aminotransferase activity and calculated risk of coronary heart disease in the United States.

    George N. Ioannou;Noel S. Weiss;Edward J. Boyko;Dariush Mozaffarian;Dariush Mozaffarian

  • Synergistic interaction of dietary cholesterol and dietary fat in inducing experimental steatohepatitis

    Christopher Savard;Christopher Savard;Erica V. Tartaglione;Rahul Kuver;W. Geoffrey Haigh

  • Dietary cholesterol exacerbates hepatic steatosis and inflammation in obese LDL receptor-deficient mice

    Savitha Subramanian;Leela Goodspeed;Shari A Wang;Jinkyu Kim

  • Is Obesity Associated With Anemia of Chronic Disease? A Population-based Study

    Karlee J. Ausk;George N. Ioannou;George N. Ioannou

  • Effectiveness of Sofosbuvir, Ledipasvir/Sofosbuvir, or Paritaprevir/Ritonavir/Ombitasvir and Dasabuvir Regimens for Treatment of Patients With Hepatitis C in the Veterans Affairs National Health Care System

    George N. Ioannou;George N. Ioannou;Lauren A. Beste;Lauren A. Beste;Michael F. Chang;Michael F. Chang;Pamela K. Green

Frequent Co-Authors

Jason A. Dominitz
Jason A. Dominitz United States Department of Veterans Affairs
Edward J. Boyko
Edward J. Boyko University of Washington
Noel S. Weiss
Noel S. Weiss University of Washington
Geoffrey C. Farrell
Geoffrey C. Farrell Australian National University
Kris V. Kowdley
Kris V. Kowdley Washington State University
Amit G. Singal
Amit G. Singal The University of Texas Southwestern Medical Center
Emily C. Williams
Emily C. Williams University of Washington
Don C. Rockey
Don C. Rockey Medical University of South Carolina
Brahmajee K. Nallamothu
Brahmajee K. Nallamothu University of Michigan–Ann Arbor
James Fogarty
James Fogarty University of Washington

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