Citation Rankings
Highly Cited Researchers
Engineering & Technology / Environmental Science & Engineering Highly Cited Researchers 37 Scientists Citation Rankings - 2025
The Citation Rankings (Highly Cited Researchers) list 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
Wastewater treatment technologies
Bioreactors
Membrane technology
Water reuse
Microbial fuel
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
16,073
6,916
0.430
* Total Citation Counts Rankings
Ranking Based On Selection: 2
Climate Change
Loss and Damage
Disaster Risk Reduction
SDGs
Coastal Resilience and Livelihoods
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,807
5,024
0.865
* Total Citation Counts Rankings
Ranking Based On Selection: 3
Environmental Sciences
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,545
1,855
0.729
* Total Citation Counts Rankings
Ranking Based On Selection: 4
Water Microbiology
Environmental Biotechnology
Biological Wastewater Treatment
Mycotoxins
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,790
1,280
0.715
* Total Citation Counts Rankings
Ranking Based On Selection: 5
Water and wastewater treatment
Renewable energy
Hydrogen production
Nanotechnology
Waste Bio-refineries technologies
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
764
434
0.568
* Total Citation Counts Rankings
Ranking Based On Selection: 6
Environmental Biotechnology
Host Pathogen Interactions
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
730
90
0.123
* Total Citation Counts Rankings
Ranking Based On Selection: 7
Water Treatment
Nanotechnology
Biogas
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
717
407
0.568
* Total Citation Counts Rankings
Ranking Based On Selection: 8
Environmental issues related to natural resource management
environmental governance
climate
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
630
588
0.933
* Total Citation Counts Rankings
Ranking Based On Selection: 9
Environmental management
environmental education
green economy
sustainable development
climate change
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
586
450
0.768
* Total Citation Counts Rankings
Ranking Based On Selection: 10
Leadership
governance
disaster management
climate change
ethics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
544
235
0.432
* Total Citation Counts Rankings
Ranking Based On Selection: 11
Wastewater
nanotechnology
metal oxides
cyclodextrin inclusion complexes
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
508
210
0.413
* Total Citation Counts Rankings
Ranking Based On Selection: 12
Electrochemical technology
Nanomaterials
Chemical sensors
Energy materials
Wastewater treatments
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
400
398
0.995
* Total Citation Counts Rankings
Ranking Based On Selection: 13
Water Management
Municipal Management
Sanitation Management
Human Settlements Management
Environmental Management
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
244
122
0.500
* Total Citation Counts Rankings
Ranking Based On Selection: 14
Climate Change Adaptation and Renewable Energy
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
238
201
0.845
* Total Citation Counts Rankings
Ranking Based On Selection: 15
Soil science
human impacts in protected areas
wildlife conservation
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
222
168
0.757
* Total Citation Counts Rankings
Ranking Based On Selection: 16
Behavioural ecology
human-wildlife conflict
wildlife management
conservation biology
responses of individuals/populations to
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
220
116
0.527
* Total Citation Counts Rankings
Ranking Based On Selection: 17
Information Systems (IS)
IT-related Organizational Change
Environmental Sustainability
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
196
128
0.653
* Total Citation Counts Rankings
Ranking Based On Selection: 18
Environmental Engineering - Water Engineering
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
164
109
0.665
* Total Citation Counts Rankings
Ranking Based On Selection: 19
Environmental-Microbiology/Biotechnology
Cell biology
Environmental Pollution control
management
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
163
111
0.681
* Total Citation Counts Rankings
Ranking Based On Selection: 20
Environmental management
Green economy
Food Security
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
140
112
0.800
* Total Citation Counts Rankings
Ranking Based On Selection: 21
Air Quality
Environmental Health
Human Health Risk Assessment
Exposure Science
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
118
95
0.805
* Total Citation Counts Rankings
Ranking Based On Selection: 22
Environment and Sustainability Education
Science Education
Early Childhood Education
Curriculum Studies
Geography Education
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
107
98
0.916
* Total Citation Counts Rankings
Ranking Based On Selection: 23
Environment
Acid Mine Drainage
Sustainable Development
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
93
62
0.667
* Total Citation Counts Rankings
Ranking Based On Selection: 24
Environmental Sciences
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
91
38
0.418
* Total Citation Counts Rankings
Ranking Based On Selection: 25
Environmental chemistry
water quality
emerging pollutants
environmental pollution and monitoring
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
67
66
0.985
* Total Citation Counts Rankings
Rankings
55,942
189
3
Ranking Based On Selection: 1
Ali Akbar Zinatizadeh
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
16,073
6,916
0.430
Wastewater treatment technologies
Bioreactors
Membrane technology
Water reuse
Microbial fuel
* Total Citation Counts Rankings
Rankings
180,906
738
19
Ranking Based On Selection: 2
Godwell Nhamo
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,807
5,024
0.865
Climate Change
Loss and Damage
Disaster Risk Reduction
SDGs
Coastal Resilience and Livelihoods
* Total Citation Counts Rankings
Rankings
375,475
1,726
47
Ranking Based On Selection: 3
Ngole-Jeme Veronica Mpode
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,545
1,855
0.729
Environmental Sciences
* Total Citation Counts Rankings
Rankings
484,696
2,308
70
Ranking Based On Selection: 4
Ilunga Kamika
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,790
1,280
0.715
Water Microbiology
Environmental Biotechnology
Biological Wastewater Treatment
Mycotoxins
* Total Citation Counts Rankings
Rankings
783,972
4,102
164
Ranking Based On Selection: 5
Taile Leswifi
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
764
434
0.568
Water and wastewater treatment
Renewable energy
Hydrogen production
Nanotechnology
Waste Bio-refineries technologies
* Total Citation Counts Rankings
Rankings
799,877
4,193
171
Ranking Based On Selection: 6
Martin Myer
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
730
90
0.123
Environmental Biotechnology
Host Pathogen Interactions
* Total Citation Counts Rankings
Rankings
805,806
4,234
172
Ranking Based On Selection: 7
Nomcebo H. Mthombeni
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
717
407
0.568
Water Treatment
Nanotechnology
Biogas
* Total Citation Counts Rankings
Rankings
849,192
4,514
187
Ranking Based On Selection: 8
Henry Bikwibili Tantoh
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
630
588
0.933
Environmental issues related to natural resource management
environmental governance
climate
* Total Citation Counts Rankings
Rankings
873,073
4,672
199
Ranking Based On Selection: 9
Muchaiteyi Togo
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
586
450
0.768
Environmental management
environmental education
green economy
sustainable development
climate change
* Total Citation Counts Rankings
Rankings
898,547
4,840
212
Ranking Based On Selection: 10
Goonasagree Naidoo
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
544
235
0.432
Leadership
governance
disaster management
climate change
ethics
* Total Citation Counts Rankings
Rankings
925,404
5,020
230
Ranking Based On Selection: 11
Lueta De Kock
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
508
210
0.413
Wastewater
nanotechnology
metal oxides
cyclodextrin inclusion complexes
* Total Citation Counts Rankings
Rankings
1,022,809
5,836
297
Ranking Based On Selection: 12
Abera Demeke Ambaye
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
400
398
0.995
Electrochemical technology
Nanomaterials
Chemical sensors
Energy materials
Wastewater treatments
* Total Citation Counts Rankings
Rankings
1,229,254
7,612
449
Ranking Based On Selection: 13
Eric Nealer
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
244
122
0.500
Water Management
Municipal Management
Sanitation Management
Human Settlements Management
Environmental Management
* Total Citation Counts Rankings
Rankings
1,239,423
7,709
459
Ranking Based On Selection: 14
Elvis Modikela Nkoana
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
238
201
0.845
Climate Change Adaptation and Renewable Energy
* Total Citation Counts Rankings
Rankings
1,269,365
7,981
491
Ranking Based On Selection: 15
Gerhard Nortje
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
222
168
0.757
Soil science
human impacts in protected areas
wildlife conservation
* Total Citation Counts Rankings
Rankings
1,273,789
8,013
493
Ranking Based On Selection: 16
Kerry Slater
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
220
116
0.527
Behavioural ecology
human-wildlife conflict
wildlife management
conservation biology
responses of individuals/populations to
* Total Citation Counts Rankings
Rankings
1,323,115
8,455
530
Ranking Based On Selection: 17
Grant R. Howard
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
196
128
0.653
Information Systems (IS)
IT-related Organizational Change
Environmental Sustainability
* Total Citation Counts Rankings
Rankings
1,400,620
9,141
594
Ranking Based On Selection: 18
Helder Pereira De Carvalho
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
164
109
0.665
Environmental Engineering - Water Engineering
* Total Citation Counts Rankings
Rankings
1,403,340
9,167
600
Ranking Based On Selection: 19
Onyedikachi Ubani
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
163
111
0.681
Environmental-Microbiology/Biotechnology
Cell biology
Environmental Pollution control
management
* Total Citation Counts Rankings
Rankings
1,468,231
9,765
662
Ranking Based On Selection: 20
Adelaide Owusu Agyepong
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
140
112
0.800
Environmental management
Green economy
Food Security
* Total Citation Counts Rankings
Rankings
1,539,707
10,428
728
Ranking Based On Selection: 21
Nomsa Thabethe
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
118
95
0.805
Air Quality
Environmental Health
Human Health Risk Assessment
Exposure Science
* Total Citation Counts Rankings
Rankings
1,578,713
10,743
759
Ranking Based On Selection: 22
Headman Hebe
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
107
98
0.916
Environment and Sustainability Education
Science Education
Early Childhood Education
Curriculum Studies
Geography Education
* Total Citation Counts Rankings
Rankings
1,635,698
11,276
815
Ranking Based On Selection: 23
Suvania Naidoo
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
93
62
0.667
Environment
Acid Mine Drainage
Sustainable Development
* Total Citation Counts Rankings
Rankings
1,645,029
11,362
831
Ranking Based On Selection: 24
Dohya Monjoa Emily Matike
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
91
38
0.418
Environmental Sciences
* Total Citation Counts Rankings
Rankings
1,753,689
12,310
938
Ranking Based On Selection: 25
Baloyi Ntsako Dellas
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
67
66
0.985
Environmental chemistry
water quality
emerging pollutants
environmental pollution and monitoring