top-cited scientists
|
2026·2025·2024
AuthorsCountriesInstitutionsFieldsNobel laureates
top-cited scientiststopcitedscientists.com
Top-cited scientists›South Africa›University of Cape Town›Zar, Heather J.
top-cited scientiststopcitedscientists.com
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249,310 authors in the 2026 list · ranked by c-score excluding self-citations
1
Wang, Zhong Lin
Chinese Academy of Sciences
🇨🇳 CHN
Nanoscience & Nanotechnology
#1 · top <0.01%
5.27240,6537341.211.0%3,0261986–2026
2
Kresse, Georg
Universität Wien
🇦🇹 AUT
Applied Physics
#1 · top <0.01%
5.24738,3373215.90.7%4111992–2026
3
Mirjalili, Seyedali
Torrens University Australia
🇦🇺 AUS
Artificial Intelligence & Image Processing
#1 · top <0.01%
5.23526,7036230.93.7%6792010–2026
4
Bandura, Albert
Stanford University
🇺🇸 USA
Social Psychology
#1 · top <0.01%
5.22212,6684132.90.2%2101953–2024
5
Grimme, Stefan
Universität Bonn
🇩🇪 DEU
Chemical Physics
#1 · top <0.01%
5.17124,5553823.72.2%7491992–2026
6
Bengio, Yoshua
Montreal Institute for Learning Algorithms
🇨🇦 CAN
Artificial Intelligence & Image Processing
#2 · top <0.01%
5.09956,6416726.40.5%6651988–2026
7
Ajzen, Icek
University of Massachusetts Amherst
🇺🇸 USA
Social Psychology
#2 · top <0.01%
5.06713,8623021.90.2%1041969–2026
8
Girshick, Ross B.
Vercept
🇺🇸 USA
Artificial Intelligence & Image Processing
#3 · top <0.01%
5.05561,3794013.80.0%922004–2025
9
Ryan, Richard M.
Australian Catholic University
🇦🇺 AUS
Social Psychology
#3 · top 0.01%
5.05325,0495833.61.3%3571980–2026
10
Altman, Douglas G.
University of Oxford Medical Sciences Division
🇬🇧 GBR
General & Internal Medicine
#1 · top <0.01%
5.03971,0898938.61.3%1,1161972–2025
11
Gross, James J.
Stanford University
🇺🇸 USA
Experimental Psychology
#1 · top <0.01%
5.02012,8745432.04.2%6441989–2026
12
Hinton, Geoffrey E.
University of TorontoNobel laureate
🇨🇦 CAN
Artificial Intelligence & Image Processing
#4 · top <0.01%
5.01152,7804524.60.1%2931979–2026
13
Perdew, John
Tulane University School of Science and Engineering
🇺🇸 USA
Applied Physics
#2 · top <0.01%
5.01030,3163718.60.6%3651970–2026
14
McClements, David Julian
University of Massachusetts Amherst
🇺🇸 USA
Food Science
#1 · top <0.01%
5.00423,1705236.95.9%1,8551987–2027
15
Lal, Rattan A.
The Ohio State University
🇺🇸 USA
Agronomy & Agriculture
#1 · top <0.01%
5.00311,2274433.94.0%1,4151922–2026
16
Breiman, Leo
University of California, Berkeley
🇺🇸 USA
Statistics & Probability
#1 · top <0.01%
5.00122,0151513.10.0%581960–2018
17
Li, Heng
Harvard Medical School
🇺🇸 USA
Bioinformatics
#1 · top <0.01%
4.98821,2394015.02.5%1342004–2026
18
Moher, David
Ottawa Hospital Research Institute
🇨🇦 CAN
General & Internal Medicine
#2 · top <0.01%
4.98688,3297519.91.0%9371984–2026
19
Higgins, Julian P.t.
Bristol Medical School
🇬🇧 GBR
General & Internal Medicine
#3 · top <0.01%
4.95654,5555823.30.8%4151996–2026
20
Neese, Frank
Max Planck Institute for Coal Research
🇩🇪 DEU
Chemical Physics
#2 · top <0.01%
4.95511,7203922.96.6%6731995–2026
21
Tibshirani, Robert John
Stanford University
🇺🇸 USA
Statistics & Probability
#2 · top <0.01%
4.95014,2904220.91.7%4321982–2026
22
Teece, David J.
University of California, Berkeley
🇺🇸 USA
Business & Management
#1 · top <0.01%
4.9389,3893125.90.5%3001971–2026
23
Friston, K. J.
UCL Queen Square Institute of Neurology
🇬🇧 GBR
Neurology & Neurosurgery
#1 · top <0.01%
4.93412,7944629.49.0%1,3731989–2026
24
Ioannidis, John P.A.
Stanford University School of Medicine
🇺🇸 USA
General & Internal Medicine
#4 · top <0.01%
4.92626,0125627.93.1%1,4881994–2026
25
Gogotsi, Yury G.
Drexel University
🇺🇸 USA
Nanoscience & Nanotechnology
#2 · top <0.01%
4.89731,8608535.33.7%1,1701984–2026

# rank by c-score; Subfield rank rank and top % in main subfield; c-score composite citation score (0–6); Cites 2025 citations in 2025; h h-index; hm co-authorship-adjusted h-index; Self-cit. self-citation share; Active years of first and last paper.

top-cited scientiststopcitedscientists.com
2026 list · citations received in 2025

Zar, Heather J.

University of Cape Town · 🇿🇦 South Africa
·

Heather J. Zar is ranked #6,162 of 249,310 in the 2026 list of top-cited scientists, often called the Stanford–Elsevier top 2% list, which counts citations received during 2025. In the career-long list (citations 1996–2025) the rank is #17,473 of 243,949.

Ranking

Compare scientists →
Global rank
#6,162
Within the top 100,000 · with self-cites: #5,094
Subfield rank
#33
top 0.05% of 71,926 authors in Respiratory System
Rank in country
#22
of 1,034 listed in South Africa
Rank in institution
#4
of 117 listed at University of Cape Town
Rank in career stage
#3,343
of 73,304 listed authors who first published before 1992 (first paper 1990)
Global and subfield ranks come from the dataset and are computed across all Scopus authors, not just this list. Country, institution and career-stage ranks are positions among authors in this list.

Across years

Each year's single-year list, excluding self-citations; each counts the citations of the year before it
YearRankc-scoreCitationsh-index
2026 this page#6,1623.58811,89434
2025#11,9623.3886,18532
2024#10,5863.4264,50628
The data has no author ID, so years are matched by name and year of first publication. Each year is a new Scopus snapshot, so a big jump can come from Scopus splitting or merging author profiles. “Not found” means the author was below that year's threshold or is listed under a different name.

Composite score (c)

3.588out of a theoretical 6 · excluding self-citations
Total citationsNC = 11,894
0.824
h-indexH = 34
0.761
hm-index (co-authorship adjusted)Hm = 8.3
0.595
Cites to single-authored papersNCS = 18
0.297
Cites to single + first-authoredNCSF = 223
0.496
Cites to single + first + last-authoredNCSFL = 888
0.616
Each indicator is scaled as log(1+x) ÷ log(1+max x) across all authors, so 1.0 equals the highest value in Scopus. c is the sum of the six.

2025 impact vs career impact

2025 impact 2025 onlyCareer impact 1996–2025
Global rank#6,162#17,473
c-score3.5884.015
Citations11,89443,190
h-index3479
hm-index8.327.0
Self-citations12.4%18.4%
Subfield rank#33 (top 0.05%)#165 (top 0.23%)

Benchmarks in Respiratory System

P25P50P75P90P95P99This author
Citations520662043981,34013,576
c-score0.500.831.281.782.102.713.65
Percentiles across all 71,926 Scopus authors in this subfield (all citations). Citations: top 1%; c-score: top 1%. Among listed authors here, 99% have self-citation below 27.7% (this author: 12.4%).

All indicators

IndicatorAll citationsExcl. self-citations
Papers (1960–2025)705
Self-citation share12.39%
Rank (c-score)5,0946,162
c-score3.6553.588
Citations13,57611,894
h-index3834
hm-index8.918.26
Single-authored papers20—
   ↳ cites to them1818
Single + first-authored papers115—
   ↳ cites to them267223
Single + first + last-authored papers291—
   ↳ cites to them1,078888
Distinct citing papers9,9149,015
Citations per citing paper1.371.32
Papers cited at least once490459
Subfield rank2533

Subject profile

Main fieldClinical Medicine68.8% of papers
Main subfieldRespiratory System13.8%
Second subfieldGeneral & Internal Medicine13.1%

Countries of publication

Most frequent country🇿🇦 South Africa · 97.5% of papers
Countries with ≥10% of papers🇿🇦 South Africa
Multi-country careerNo (country data covers 93% of papers)

Retractions (Retraction Watch)

Retracted papers0
Citations to their retracted papers0
Citations received from retracted papers (any author)0
Retraction counts come from linking Scopus to the Retraction Watch database; a retraction is not by itself evidence of misconduct.

Look up elsewhere

Open in the full listGoogle Scholar ↗ORCID ↗

Searches by name, so results can include namesakes. Scopus profile data (the source) can be corrected only via the Scopus Author Feedback Wizard.

This page online: https://topcitedscientists.com/scientist/heather-j-zar/

Data: Ioannidis, John P.A. (2026), ‘August 2026 data-update for “Updated science-wide author databases of standardized citation indicators”’, Mendeley Data, v9, doi:10.17632/btchxktzyw.9. 2026 list, ranked by composite citation score (c) excluding self-citations.

Printed from topcitedscientists.com, an independent site not affiliated with or endorsed by the dataset authors, Stanford University, Elsevier or Scopus. This is not an official document.

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