202420252026
Citation indicators
World's Top 2% Scientists
Compiled each year by John Ioannidis at Stanford University with Elsevier, from Scopus data
I've been named in the 2024, 2025 and 2026 editions of this list of the world's most-cited scientists, in the tables that rank researchers on citations received in a single year. In the 2026 edition I'm in the top 0.51% of researchers in Energy, and inside the top 100,000 across all fields of science.
- Energy · 2026 edition
- Top 0.51%
- 1,907th of 371,959 researchers
- All fields · 2026 edition
- 64,433rd
- Inside the top 100,000 across all fields
- Consecutive editions
- 3
- 2024, 2025 and 2026
- Citations in 2025
- 1,371
- Scopus, single year · self-citations under 3%
Year by year
| Edition | Rank in Energy | Top % in Energy | Rank, all fields | Citations | Composite score |
|---|---|---|---|---|---|
| 2026Citations in 2025 | 1,907of 371,959 | 0.51% | 64,433 | 1,371 | 2.918 |
| 2025Citations in 2024 | 2,288of 343,394 | 0.67% | 76,138 | 1,209 | 2.850 |
| 2024Citations in 2023 | 3,845of 313,936 | 1.22% | 135,221 | 864 | 2.644 |
Position in Energy, on a scale from the 2% inclusion threshold (left) to first place (right)
Over the three editions my position in Energy has risen from the top 1.22% to the top 0.51%, and the citations behind it have grown from 864 to 1,371 a year. Much of this reflects the continuing take-up of our 2019 Nature review on recycling lithium-ion batteries from electric vehicles, alongside newer work on the battery circular economy and critical materials. Self-citations make up under 3% of the 2025 total.
Citation indicators are one lens on research impact. I report them alongside the qualitative evidence of what the work has changed, in keeping with responsible research assessment.
About the list
Researchers are ranked on a composite score that combines six citation measures: total citations, the h-index, a co-authorship-adjusted h-index, and citations to papers written as sole, first or last author. The score runs from 0 to 6.
Anyone in the top 100,000 across all fields, or in the top 2% of their own subfield, is included. The list comes in two forms, career-long and single recent year. The figures here are from the single-year tables, which count citations received in one calendar year. Ranks shown are the published ranks, which include self-citations.
Sources
- Ioannidis, J.P.A. (2026) ‘August 2026 data-update for “Updated science-wide author databases of standardized citation indicators”’, Elsevier Data Repository, V9. doi:10.17632/btchxktzyw.9
- Ioannidis, J.P.A. (2025) ‘August 2025 data-update for “Updated science-wide author databases of standardized citation indicators”’, Elsevier Data Repository, V8. doi:10.17632/btchxktzyw.8
- Ioannidis, J.P.A. (2024) ‘August 2024 data-update for “Updated science-wide author databases of standardized citation indicators”’, Elsevier Data Repository, V7. doi:10.17632/btchxktzyw.7
- Method: Ioannidis, J.P.A., Boyack, K.W. and Baas, J. (2020) ‘Updated science-wide author databases of standardized citation indicators’, PLOS Biology, 18(10), e3000918. doi:10.1371/journal.pbio.3000918
Figures as published in each edition. Each edition uses a Scopus snapshot taken on 1 August. Checked 8 October 2026.