Institutional positions in the ranking are determined by the collective D-indexes (Discipline H-index) of all affiliated scholars whose primary field of publication is Medicine. The D-index is an advanced metric designed to capture only publications and related citations within a specific discipline, ensuring that the assessment exclusively reflects research output in Medicine.
Scope and Criteria of Research Assessment
An extensive evaluation process underpins the ranking's methodology. In total, 279,971 scientist profiles were identified through various bibliometric sources, with 72,221 scientists specifically analyzed for their contributions to Medicine. To ensure scholarly excellence, a qualifying D-index threshold of 70 was established, and the majority of each scientist’s major publications had to be in the domain of Medicine. Researchers' awards and achievements in Medicine were also taken into account as supporting factors.
For the inclusion of top-tier researchers, the D-index threshold was incremented by 10 according to the total number of scholars within each discipline, while ensuring that the leading 1% of scholars were comprehensively represented. Additionally, a proximity criterion required that the gap between a scientist’s general H-index and their D-index remain within 30%, further emphasizing discipline-specific scholarship. This multi-layered approach, where recognitions and achievements form a secondary factor, ensures a balanced and precise identification of top experts.
Verification and Data Integrity
The creators of this ranking recognize that citation data alone cannot wholly capture the value or influence of a scholar’s contributions. Therefore, all scientist profiles were manually verified and cross-referenced with their output in a broad selection of reputable sources. While the number of articles published in prominent journals and conference proceedings does not directly impact a researcher's position in the ranking, it is acknowledged as a valuable supplementary indicator of a researcher's impact in Medicine.
Positions in the ranking are ultimately determined using H-index values as provided by OpenAlex and CrossRef, which are widely regarded as the most credible and exhaustive bibliometric resources available to scholars worldwide. To better understand the methodology and guiding principles behind this ranking, please consult our methodology page.
Purpose and Mission of the Research.com Rankings
The core mission of Research.com in producing this ranking is to inspire scientists, business leaders, and policymakers globally to pursue deeper insights into the trends and directions of leading experts in Medicine. By providing a transparent and reliable framework, our ranking supports the wider research community in identifying who the foremost specialists are within specific disciplines, as well as across different countries and research institutions.
Key Results of the 2024 Ranking
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Top 3 U.S. Institutions with the Highest Number of Leading Scientists:
- Harvard University – 546 scientists
- University of California, San Francisco – 297 scientists
- Stanford University – 231 scientists
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The most prominent scholars in Medicine in the world are affiliated with: Harvard University, Harvard Medical School, Washington University in St. Louis, McMaster University, Johns Hopkins University, University of Oxford, University of Bristol, University of Pennsylvania, Yale University, and the University of Cambridge.
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Top ranked individual scientists worldwide:
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Professor Walter C. Willett (Harvard University) – D-index: 411 (Ranked #1 globally)
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Ronald C. Kessler (Harvard University) – D-index: 332 (Ranked #2 globally)
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Meir J. Stampfer (Harvard University) – D-index: 330 (Ranked #3 globally)
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The average total D-index for the top 5% of universities is 16,901 compared to an average of 1,798 for all 875 institutions included in the ranking.
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Average number of published articles in Medicine among scholars at the top 5% universities: 82,045; overall average across all universities: 9,438.
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Average number of citations for researchers in the top 1% of universities: 17,279,971, compared to an overall institutional average of 279,971.
These results reflect a rigorous, transparent, and sophisticated evaluation process that emphasizes scholarly excellence, discipline-specific achievement, and careful data validation. We invite you to further examine the details of our methodology on our methodology page.
