Citation Rankings
Highly Cited Researchers
Highly Cited Researchers Citation Rankings 2025
The Citation Rankings (Highly Cited Researchers) highlight the most cited and influential researchers across a vast range of scientific fields, covering 197 main and sub-disciplines, including the Art and Humanities Citation Rankings and Social Sciences and Humanities Citation Rankings. This service, offered exclusively by AD Scientific Index, aims to provide a balanced perspective by excluding data from CERN and other statistical sources that disproportionately favor certain researchers, particularly in the social sciences and humanities. This unique approach addresses the advantages researchers with multi-author publications and CERN involvement hold over others. Furthermore, citation rankings help uncover rule violations and unethical practices within the research community. For more detailed citation analyses, explore the Scientists Last 6 Years Citation Index, Universities Total Citations Rankings 2025, and Universities Last 6 Years Citations Rankings 2025.
* Total Citation Counts Rankings
Ranking Based On Selection: 1
corrosion
corrosion inhibition
corrosion of metals
adsorption
quantum chemical calculations
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
38,952
25,688
0.659
* Total Citation Counts Rankings
Ranking Based On Selection: 2
Haematology
Immunology
Blood Group Serology
Blood Transfusion Science
Public Health
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
33,649
33,197
0.987
* Total Citation Counts Rankings
Ranking Based On Selection: 3
Nanotechnology for Water Treatment
Membrane Technology
Water Treatment Technologies
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
20,093
15,235
0.758
* Total Citation Counts Rankings
Ranking Based On Selection: 4
Wastewater treatment technologies
Bioreactors
Membrane technology
Water reuse
Microbial fuel
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,795
7,729
0.489
* Total Citation Counts Rankings
Ranking Based On Selection: 5
Macroeconomic Policy
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,572
11,479
0.737
* Total Citation Counts Rankings
Ranking Based On Selection: 6
Fractional Differential equations
Lie Symmetry
Bio-Mathematics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,178
7,381
0.606
* Total Citation Counts Rankings
Ranking Based On Selection: 7
Career and Human Capacity Development
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,149
5,416
0.534
* Total Citation Counts Rankings
Ranking Based On Selection: 8
Analytical Chemistry
Aquatic Toxicology
Chromatography
Mass spectrometry
Food Chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,479
7,495
0.791
* Total Citation Counts Rankings
Ranking Based On Selection: 9
genomics
bioinformatics
genetics
plant breeding
plant pathogens
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,071
2,689
0.296
* Total Citation Counts Rankings
Ranking Based On Selection: 10
Politics
Philosophy and Economics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,727
8,190
0.938
* Total Citation Counts Rankings
Ranking Based On Selection: 11
Artificial Intelligence
Industry 4.0/5.0
Control Engineering
Evolutionary Optimization
Chaos
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,531
7,796
0.914
* Total Citation Counts Rankings
Ranking Based On Selection: 12
Preservation
Records management
Knowledge management
Research methods
indigenous knowledge
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,166
5,031
0.616
* Total Citation Counts Rankings
Ranking Based On Selection: 13
NanoScience and Nanotechnology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,565
3,955
0.523
* Total Citation Counts Rankings
Ranking Based On Selection: 14
educational technology
higher education
learning analytics
student success
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,307
4,750
0.753
* Total Citation Counts Rankings
Ranking Based On Selection: 15
Electrochemistry
Electrocatalysis
Energy Storage devices
Electrodeposition
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,060
3,858
0.637
* Total Citation Counts Rankings
Ranking Based On Selection: 16
Energy Efficiency
Fischer Tropsch
Process Synthesis
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,013
2,651
0.441
* Total Citation Counts Rankings
Ranking Based On Selection: 17
Catalysis
catalytic energy conversion
fuel cell technology
surface chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,961
1,498
0.251
* Total Citation Counts Rankings
Ranking Based On Selection: 18
Sol-Gel Technology
Nanomaterials
Ceramics and Water Treatment
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,687
3,546
0.624
* Total Citation Counts Rankings
Ranking Based On Selection: 19
Fischer-Tropsch
Reactor design
Process Engineering
Comminution
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,616
1,612
0.287
* Total Citation Counts Rankings
Ranking Based On Selection: 20
Polymers
Organic chemistry
Coating
Corrosion
Nanotechnology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,602
5,514
0.984
* Total Citation Counts Rankings
Ranking Based On Selection: 21
Climate Change
Loss and Damage
Disaster Risk Reduction
SDGs
Coastal Resilience and Livelihoods
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,506
4,961
0.901
* Total Citation Counts Rankings
Ranking Based On Selection: 22
Advanced oxidation processes
Nanomaterial synthesis
Heterogeneous catalysis
Water treatment
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,913
4,416
0.899
* Total Citation Counts Rankings
Ranking Based On Selection: 23
Business and management
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,687
1,742
0.372
* Total Citation Counts Rankings
Ranking Based On Selection: 24
Facilitation of learning
research as active involvement
researcher accountabilities
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,395
1,558
0.354
* Total Citation Counts Rankings
Ranking Based On Selection: 25
Coordination chemistry
Magnetic nanoparticle
Photocatalyst
Acid mine drainage
Emerging organic pollutant
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,375
3,956
0.904
* Total Citation Counts Rankings
Rankings
14,910
43
1
Ranking Based On Selection: 1
Eno E. Ebenso
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
38,952
25,688
0.659
corrosion
corrosion inhibition
corrosion of metals
adsorption
quantum chemical calculations
* Total Citation Counts Rankings
Rankings
18,717
1
1
Ranking Based On Selection: 2
Emmanuel Ifeanyi Obeagu
Africa University
Mutare, Zimbabwe
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
33,649
33,197
0.987
Haematology
Immunology
Blood Group Serology
Blood Transfusion Science
Public Health
* Total Citation Counts Rankings
Rankings
40,335
123
2
Ranking Based On Selection: 3
Bhekie Mamba
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
20,093
15,235
0.758
Nanotechnology for Water Treatment
Membrane Technology
Water Treatment Technologies
* Total Citation Counts Rankings
Rankings
55,837
187
3
Ranking Based On Selection: 4
Ali Akbar Zinatizadeh
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,795
7,729
0.489
Wastewater treatment technologies
Bioreactors
Membrane technology
Water reuse
Microbial fuel
* Total Citation Counts Rankings
Rankings
56,870
190
4
Ranking Based On Selection: 5
Nicholas M Odhiambo
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,572
11,479
0.737
* Total Citation Counts Rankings
Rankings
77,925
265
5
Ranking Based On Selection: 6
Hossein Jafari
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,178
7,381
0.606
Fractional Differential equations
Lie Symmetry
Bio-Mathematics
* Total Citation Counts Rankings
Rankings
96,888
345
6
Ranking Based On Selection: 7
Melinde Coetzee
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,149
5,416
0.534
* Total Citation Counts Rankings
Rankings
104,672
374
7
Ranking Based On Selection: 8
Titus AM Msagati
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,479
7,495
0.791
Analytical Chemistry
Aquatic Toxicology
Chromatography
Mass spectrometry
Food Chemistry
* Total Citation Counts Rankings
Rankings
110,075
399
8
Ranking Based On Selection: 9
Jasper Rees
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,071
2,689
0.296
genomics
bioinformatics
genetics
plant breeding
plant pathogens
* Total Citation Counts Rankings
Rankings
114,997
426
9
Ranking Based On Selection: 10
Smanga Hlongwa
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,727
8,190
0.938
Politics
Philosophy and Economics
* Total Citation Counts Rankings
Rankings
117,952
444
10
Ranking Based On Selection: 11
Zenghui Wang
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,531
7,796
0.914
Artificial Intelligence
Industry 4.0/5.0
Control Engineering
Evolutionary Optimization
Chaos
* Total Citation Counts Rankings
Rankings
123,851
463
11
Ranking Based On Selection: 12
Patrick Ngulube
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,166
5,031
0.616
Preservation
Records management
Knowledge management
Research methods
indigenous knowledge
* Total Citation Counts Rankings
Rankings
134,667
529
12
Ranking Based On Selection: 13
Sekhar Chandra Ray
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,565
3,955
0.523
* Total Citation Counts Rankings
Rankings
162,993
641
13
Ranking Based On Selection: 14
Paul Prinsloo
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,307
4,750
0.753
educational technology
higher education
learning analytics
student success
* Total Citation Counts Rankings
Rankings
169,684
676
14
Ranking Based On Selection: 15
Mkhulu Mathe
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,060
3,858
0.637
Electrochemistry
Electrocatalysis
Energy Storage devices
Electrodeposition
* Total Citation Counts Rankings
Rankings
170,987
686
15
Ranking Based On Selection: 16
Diane Hildebrandt
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,013
2,651
0.441
Energy Efficiency
Fischer Tropsch
Process Synthesis
* Total Citation Counts Rankings
Rankings
172,501
694
16
Ranking Based On Selection: 17
Mike Scurrell
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,961
1,498
0.251
Catalysis
catalytic energy conversion
fuel cell technology
surface chemistry
* Total Citation Counts Rankings
Rankings
180,794
736
17
Ranking Based On Selection: 18
Shivani Bhardwaj Mishra
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,687
3,546
0.624
Sol-Gel Technology
Nanomaterials
Ceramics and Water Treatment
* Total Citation Counts Rankings
Rankings
183,079
752
18
Ranking Based On Selection: 19
David Glasser
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,616
1,612
0.287
* Total Citation Counts Rankings
Rankings
183,460
755
19
Ranking Based On Selection: 20
Omar Dagdag
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,602
5,514
0.984
Polymers
Organic chemistry
Coating
Corrosion
Nanotechnology
* Total Citation Counts Rankings
Rankings
186,509
773
20
Ranking Based On Selection: 21
Godwell Nhamo
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,506
4,961
0.901
Climate Change
Loss and Damage
Disaster Risk Reduction
SDGs
Coastal Resilience and Livelihoods
* Total Citation Counts Rankings
Rankings
208,407
871
21
Ranking Based On Selection: 22
Alex Kuvarega
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,913
4,416
0.899
Advanced oxidation processes
Nanomaterial synthesis
Heterogeneous catalysis
Water treatment
* Total Citation Counts Rankings
Rankings
217,972
89
1
Ranking Based On Selection: 23
Alex Douglas
Management University of Africa
Nairobi, Kenya
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,687
1,742
0.372
* Total Citation Counts Rankings
Rankings
231,472
968
22
Ranking Based On Selection: 24
Norma Romm
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,395
1,558
0.354
Facilitation of learning
research as active involvement
researcher accountabilities
* Total Citation Counts Rankings
Rankings
232,361
971
23
Ranking Based On Selection: 25
Kebede Keterew Kefeni
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,375
3,956
0.904
Coordination chemistry
Magnetic nanoparticle
Photocatalyst
Acid mine drainage
Emerging organic pollutant