Citation Rankings
Highly Cited Researchers
United Nations University 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
Unconventional water resources
water recycling and reuse
water quality and environmental health
water security
land degradat
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
20,426
12,032
0.589
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :2
Economics
Labor Economics
Population Economics
Migration
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
29,364
8,413
0.287
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :3
Computer Science
Software Engineering
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,724
7,940
0.624
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :4
Water
hydrology
floods
droughts
environmental flows
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
13,451
7,054
0.524
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :5
Disaster risk reduction and adptation
risk tipping points
ecosystem loss and damege
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,049
6,913
0.859
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :6
E-waste
Sustainable Production
Consumption and Disposal
Technology Transfer
Environmental Policies
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,277
6,769
0.659
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :7
Environment
waste management
sustainable development
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,866
5,122
0.873
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :8
Sustainability Research
Digital Transformations
Global Governance
Climate Politics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,566
4,453
0.354
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :9
Professor of Environmental Health
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,810
2,880
0.599
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :10
Oil and gas
Mining
Extractives
Aid
Poverty
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,542
2,855
0.379
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :11
Development Economics
Social Protection
Poverty
Inequality
Political Economy
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,303
2,623
0.610
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :12
Human Mobility
Climate Mobility
Environmental Migration
Displacement
Loss and Damage
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,728
2,622
0.703
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :13
vulnerability
systemic risk
risk management
adaptation
hydrological extremes
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,983
2,433
0.816
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :14
E-waste
Waste Management
Life Cycle Asssessment
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,881
2,350
0.606
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :15
sustainability
waste management
circular economy
geotechnical engineering
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,044
2,249
0.739
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :16
Remote Sensing/GIS
Environment
Water Resources
Agriculture
Climate Change
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,701
2,118
0.784
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :17
Hydrology
Climate Change and Impacts
Urban Water
Disaster Risk Reduction
Numerical Modeling
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,487
2,080
0.464
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :18
Development Economics
Foreign Aid
Education
Africa
Mozambique
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,913
2,052
0.524
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :19
firm growth innovation entrepreneurship employment empowerment developing countries
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,888
1,899
0.488
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :20
Economic Development
International Economics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,311
1,850
0.429
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :21
Decision Support Systems
Crisis Response and Management
Policy Analysis
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,278
1,794
0.340
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :22
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,850
1,650
0.892
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :23
Inequality
Political Economics
Development Economics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,208
1,453
0.658
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :24
innovation
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,632
1,436
0.546
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :25
e-waste
weee
consumer behaviour
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,776
1,392
0.369
* Last 6 Years Citation Counts Rankings
Rankings
27,783
290
1
Ranking Based On Selection: 1
Manzoor Qadir
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
20,426
12,032
0.589
Unconventional water resources
water recycling and reuse
water quality and environmental health
water security
land degradat
* Last 6 Years Citation Counts Rankings
Rankings
47,080
549
2
Ranking Based On Selection: 2
Klaus F Zimmermann
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
29,364
8,413
0.287
Economics
Labor Economics
Population Economics
Migration
* Last 6 Years Citation Counts Rankings
Rankings
51,097
611
3
Ranking Based On Selection: 3
Zhiming Liu
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,724
7,940
0.624
Computer Science
Software Engineering
* Last 6 Years Citation Counts Rankings
Rankings
60,290
772
4
Ranking Based On Selection: 4
Vladimir Smakhtin
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
13,451
7,054
0.524
Water
hydrology
floods
droughts
environmental flows
* Last 6 Years Citation Counts Rankings
Rankings
62,036
807
5
Ranking Based On Selection: 5
Zita Sebesvari
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,049
6,913
0.859
Disaster risk reduction and adptation
risk tipping points
ecosystem loss and damege
* Last 6 Years Citation Counts Rankings
Rankings
63,858
833
6
Ranking Based On Selection: 6
Ruediger Kuehr
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,277
6,769
0.659
E-waste
Sustainable Production
Consumption and Disposal
Technology Transfer
Environmental Policies
* Last 6 Years Citation Counts Rankings
Rankings
91,898
1,294
7
Ranking Based On Selection: 7
Vanessa Forti
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,866
5,122
0.873
Environment
waste management
sustainable development
* Last 6 Years Citation Counts Rankings
Rankings
109,412
1,601
8
Ranking Based On Selection: 8
Dirk Messner
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,566
4,453
0.354
Sustainability Research
Digital Transformations
Global Governance
Climate Politics
* Last 6 Years Citation Counts Rankings
Rankings
181,602
2,896
9
Ranking Based On Selection: 9
Jamal Hisham Hashim
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,810
2,880
0.599
* Last 6 Years Citation Counts Rankings
Rankings
183,344
2,924
10
Ranking Based On Selection: 10
Tony Addison
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,542
2,855
0.379
Oil and gas
Mining
Extractives
Aid
Poverty
* Last 6 Years Citation Counts Rankings
Rankings
200,816
3,262
11
Ranking Based On Selection: 11
Miguel Niño Zarazúa
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,303
2,623
0.610
Development Economics
Social Protection
Poverty
Inequality
Political Economy
* Last 6 Years Citation Counts Rankings
Rankings
200,925
3,264
12
Ranking Based On Selection: 12
Kees Van Der Geest
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,728
2,622
0.703
Human Mobility
Climate Mobility
Environmental Migration
Displacement
Loss and Damage
* Last 6 Years Citation Counts Rankings
Rankings
217,558
3,549
13
Ranking Based On Selection: 13
Michael Enlocher
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,983
2,433
0.816
vulnerability
systemic risk
risk management
adaptation
hydrological extremes
* Last 6 Years Citation Counts Rankings
Rankings
225,498
3,684
14
Ranking Based On Selection: 14
Feng Wang
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,881
2,350
0.606
* Last 6 Years Citation Counts Rankings
Rankings
235,826
3,879
15
Ranking Based On Selection: 15
Hiroshan Hettiarachchi
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,044
2,249
0.739
sustainability
waste management
circular economy
geotechnical engineering
* Last 6 Years Citation Counts Rankings
Rankings
250,601
4,145
16
Ranking Based On Selection: 16
Gerald Forkuor
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,701
2,118
0.784
Remote Sensing/GIS
Environment
Water Resources
Agriculture
Climate Change
* Last 6 Years Citation Counts Rankings
Rankings
255,209
4,227
17
Ranking Based On Selection: 17
Srikantha Herath
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,487
2,080
0.464
Hydrology
Climate Change and Impacts
Urban Water
Disaster Risk Reduction
Numerical Modeling
* Last 6 Years Citation Counts Rankings
Rankings
258,730
4,288
18
Ranking Based On Selection: 18
Sam Jones
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,913
2,052
0.524
Development Economics
Foreign Aid
Education
Africa
Mozambique
* Last 6 Years Citation Counts Rankings
Rankings
279,132
4,690
19
Ranking Based On Selection: 19
Micheline Goedhuys
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,888
1,899
0.488
firm growth innovation entrepreneurship employment empowerment developing countries
* Last 6 Years Citation Counts Rankings
Rankings
286,129
4,820
20
Ranking Based On Selection: 20
Foster Mcgregor Neil
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,311
1,850
0.429
Economic Development
International Economics
* Last 6 Years Citation Counts Rankings
Rankings
294,467
4,988
21
Ranking Based On Selection: 21
Bartel Van De Walle
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,278
1,794
0.340
Decision Support Systems
Crisis Response and Management
Policy Analysis
* Last 6 Years Citation Counts Rankings
Rankings
318,168
5,474
22
Ranking Based On Selection: 22
Keshav Parajuly
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,850
1,650
0.892
* Last 6 Years Citation Counts Rankings
Rankings
356,384
6,209
23
Ranking Based On Selection: 23
Bruno Martorano
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,208
1,453
0.658
Inequality
Political Economics
Development Economics
* Last 6 Years Citation Counts Rankings
Rankings
360,065
6,283
24
Ranking Based On Selection: 24
Fred Gault
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,632
1,436
0.546
* Last 6 Years Citation Counts Rankings
Rankings
369,910
6,496
25
Ranking Based On Selection: 25
Deepali Sinha Khetriwal
United Nations University
Tokyo, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,776
1,392
0.369
e-waste
weee
consumer behaviour