Citation Rankings
Highly Cited Researchers
Highly Cited Researchers Citation Rankings (Sort by last 6 years Citation Index) 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.
* Last 6 Years 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
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 2
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
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 3
Macroeconomic Policy
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,572
11,479
0.737
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 4
Politics
Philosophy and Economics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,727
8,190
0.938
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 5
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
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 6
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
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 7
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
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 8
Fractional Differential equations
Lie Symmetry
Bio-Mathematics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,178
7,381
0.606
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 9
Polymers
Organic chemistry
Coating
Corrosion
Nanotechnology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,602
5,514
0.984
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 10
Career and Human Capacity Development
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,149
5,416
0.534
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 11
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
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 12
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
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 13
educational technology
higher education
learning analytics
student success
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,307
4,750
0.753
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 14
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
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 15
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
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 16
NanoScience and Nanotechnology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,565
3,955
0.523
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 17
Electrochemistry
Electrocatalysis
Energy Storage devices
Electrodeposition
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,060
3,858
0.637
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 18
Artificial Intelligence
Evolutionary Computation
AI in Business and AI Strategy
IT Strategy
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,959
3,808
0.962
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 19
Sol-Gel Technology
Nanomaterials
Ceramics and Water Treatment
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,687
3,546
0.624
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 20
Analytical Chemistry
Environmental Monitoring
Chromatography
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,491
3,289
0.942
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 21
Natural Organic Matter
Urban Water Cycle
Nanotechnology for Water Treatment
Drinking Water Treatment
Membrane Science and Te
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,428
3,259
0.951
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 22
Nanoscience and Nanotechnology
Surface Science
Nanophosphors
Energy
Material Sciences
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,738
3,169
0.848
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 23
genomics
bioinformatics
genetics
plant breeding
plant pathogens
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,071
2,689
0.296
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 24
biomedical science
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,691
2,675
0.994
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 25
Energy Efficiency
Fischer Tropsch
Process Synthesis
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,013
2,651
0.441
* Last 6 Years Citation Counts Rankings
Rankings
8,757
38
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
* Last 6 Years Citation Counts Rankings
Rankings
19,244
72
2
Ranking Based On Selection: 2
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
* Last 6 Years Citation Counts Rankings
Rankings
29,611
116
3
Ranking Based On Selection: 3
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
* Last 6 Years Citation Counts Rankings
Rankings
48,622
198
4
Ranking Based On Selection: 4
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
* Last 6 Years Citation Counts Rankings
Rankings
52,087
213
5
Ranking Based On Selection: 5
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
* Last 6 Years Citation Counts Rankings
Rankings
52,736
216
6
Ranking Based On Selection: 6
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
* Last 6 Years Citation Counts Rankings
Rankings
55,093
221
7
Ranking Based On Selection: 7
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
* Last 6 Years Citation Counts Rankings
Rankings
56,250
230
8
Ranking Based On Selection: 8
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
* Last 6 Years Citation Counts Rankings
Rankings
83,151
330
9
Ranking Based On Selection: 9
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
* Last 6 Years Citation Counts Rankings
Rankings
85,071
347
10
Ranking Based On Selection: 10
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
* Last 6 Years Citation Counts Rankings
Rankings
93,440
380
11
Ranking Based On Selection: 11
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
* Last 6 Years Citation Counts Rankings
Rankings
95,044
396
12
Ranking Based On Selection: 12
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
* Last 6 Years Citation Counts Rankings
Rankings
100,356
417
13
Ranking Based On Selection: 13
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
* Last 6 Years Citation Counts Rankings
Rankings
109,918
462
14
Ranking Based On Selection: 14
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
* Last 6 Years Citation Counts Rankings
Rankings
125,383
538
15
Ranking Based On Selection: 15
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
* Last 6 Years Citation Counts Rankings
Rankings
125,409
539
16
Ranking Based On Selection: 16
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
* Last 6 Years Citation Counts Rankings
Rankings
129,111
553
17
Ranking Based On Selection: 17
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
* Last 6 Years Citation Counts Rankings
Rankings
131,125
564
18
Ranking Based On Selection: 18
Waseem Rawat
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,959
3,808
0.962
Artificial Intelligence
Evolutionary Computation
AI in Business and AI Strategy
IT Strategy
* Last 6 Years Citation Counts Rankings
Rankings
142,583
616
19
Ranking Based On Selection: 19
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
* Last 6 Years Citation Counts Rankings
Rankings
155,563
676
20
Ranking Based On Selection: 20
Lawrence Madikizela
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,491
3,289
0.942
Analytical Chemistry
Environmental Monitoring
Chromatography
* Last 6 Years Citation Counts Rankings
Rankings
157,157
685
21
Ranking Based On Selection: 21
Thabo Ti Nkambule
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,428
3,259
0.951
Natural Organic Matter
Urban Water Cycle
Nanotechnology for Water Treatment
Drinking Water Treatment
Membrane Science and Te
* Last 6 Years Citation Counts Rankings
Rankings
162,226
707
22
Ranking Based On Selection: 22
Simon Dhlamini
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,738
3,169
0.848
Nanoscience and Nanotechnology
Surface Science
Nanophosphors
Energy
Material Sciences
* Last 6 Years Citation Counts Rankings
Rankings
194,387
843
23
Ranking Based On Selection: 23
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
* Last 6 Years Citation Counts Rankings
Rankings
195,539
851
24
Ranking Based On Selection: 24
Daniel Atlaw
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,691
2,675
0.994
* Last 6 Years Citation Counts Rankings
Rankings
197,343
860
25
Ranking Based On Selection: 25
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