University, Subject, Country, Region, World
United Nations 382 Scientists Subject Rankings - 2025
The AD Scientific Index (Alper-Doger Scientific Index) provides the most comprehensive analysis across 13 main fields and 197 sub-branches at global, national, and regional levels. These analyses are based on indicators such as the H-index, i10-index, and citation count, including their values from the last 6 years. As of Jan 30, 2025, the rankings are determined according to the Total H Index. BETA VERSION: The subject field rankings for the world, regions, countries, and universities are currently in their Beta phase. This is due to the exclusion of (873.690) scientists categorized under ‘Others’, whose profiles have yet to be determined, edited, or classified. As updates are made to these fields, the rankings will be adjusted accordingly. Note: Please keep this in mind while reviewing the rankings. For further details, explore our [University Subject Rankings].
* Total H IndexRankings
Ranking Based On Selection: 1
Economics
Labor Economics
Population Economics
Migration
Metrics
H-Index
i10 Index
Citation Counts
89
320
29,602
* Total H IndexRankings
Ranking Based On Selection: 2
Unconventional water resources
water recycling and reuse
water quality and environmental health
water security
land degradat
Metrics
H-Index
i10 Index
Citation Counts
65
132
20,961
* Total H IndexRankings
Ranking Based On Selection: 3
Computer Science
Software Engineering
Metrics
H-Index
i10 Index
Citation Counts
57
237
13,094
* Total H IndexRankings
Ranking Based On Selection: 4
biotechnology
microbiology
wastewater treatment
environmental engineering
pollution prevention and resource recovery
Metrics
H-Index
i10 Index
Citation Counts
51
110
9,276
* Total H IndexRankings
Ranking Based On Selection: 5
Sustainability Research
Digital Transformations
Global Governance
Climate Politics
Metrics
H-Index
i10 Index
Citation Counts
51
153
12,815
* Total H IndexRankings
Ranking Based On Selection: 6
Water
hydrology
floods
droughts
environmental flows
Metrics
H-Index
i10 Index
Citation Counts
49
118
13,748
* Total H IndexRankings
Ranking Based On Selection: 7
National Accounts
Official Statistics and Economics
Metrics
H-Index
i10 Index
Citation Counts
48
314
11,535
* Total H IndexRankings
Ranking Based On Selection: 8
Oil and gas
Mining
Extractives
Aid
Poverty
Metrics
H-Index
i10 Index
Citation Counts
46
112
7,649
* Total H IndexRankings
Ranking Based On Selection: 9
demography
public health
collective action
social statistics
Metrics
H-Index
i10 Index
Citation Counts
41
58
4,352
* Total H IndexRankings
Ranking Based On Selection: 10
Disaster risk reduction and adptation
risk tipping points
ecosystem loss and damege
Metrics
H-Index
i10 Index
Citation Counts
39
60
8,413
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* Total H IndexRankings
Ranking Based On Selection: 11
Water
environment
irrigation
modeling
hydrology
Metrics
H-Index
i10 Index
Citation Counts
39
111
9,317
* Total H IndexRankings
Ranking Based On Selection: 12
Professor of Environmental Health
Metrics
H-Index
i10 Index
Citation Counts
38
71
4,913
* Total H IndexRankings
Ranking Based On Selection: 13
education
sustainable development
economics
Metrics
H-Index
i10 Index
Citation Counts
37
56
15,237
* Total H IndexRankings
Ranking Based On Selection: 14
Human Mobility
Climate Mobility
Environmental Migration
Displacement
Loss and Damage
Metrics
H-Index
i10 Index
Citation Counts
34
54
3,885
* Total H IndexRankings
Ranking Based On Selection: 15
Decision Support Systems
Crisis Response and Management
Policy Analysis
Metrics
H-Index
i10 Index
Citation Counts
34
90
5,365
* Total H IndexRankings
Ranking Based On Selection: 16
higher education policy
comparative education
educational technology
Metrics
H-Index
i10 Index
Citation Counts
34
64
5,678
* Total H IndexRankings
Ranking Based On Selection: 17
environmental exposures and health
Metrics
H-Index
i10 Index
Citation Counts
33
52
2,670
* Total H IndexRankings
Ranking Based On Selection: 18
Economic Development
International Economics
Metrics
H-Index
i10 Index
Citation Counts
32
71
4,382
* Total H IndexRankings
Ranking Based On Selection: 19
Hydrology
Climate Change and Impacts
Urban Water
Disaster Risk Reduction
Numerical Modeling
Metrics
H-Index
i10 Index
Citation Counts
32
68
4,551
* Total H IndexRankings
Ranking Based On Selection: 20
Health Economics
Statistics
Data Science
Program Evaluation
Metrics
H-Index
i10 Index
Citation Counts
32
64
4,747
* Total H IndexRankings
Ranking Based On Selection: 21
Metrics
H-Index
i10 Index
Citation Counts
32
72
4,363
* Total H IndexRankings
Ranking Based On Selection: 22
marine biology
Metrics
H-Index
i10 Index
Citation Counts
31
42
6,132
* Total H IndexRankings
Ranking Based On Selection: 23
Development Economics
Labour markets
Foreign Aid
Education
Mozambique
Metrics
H-Index
i10 Index
Citation Counts
30
51
3,951
* Total H IndexRankings
Ranking Based On Selection: 24
foreign direct investment
FDI
multinational enterprises
international business
Metrics
H-Index
i10 Index
Citation Counts
30
62
3,402
* Total H IndexRankings
Ranking Based On Selection: 25
vulnerability
systemic risk
risk management
adaptation
hydrological extremes
Metrics
H-Index
i10 Index
Citation Counts
29
41
3,130
Klaus F Zimmermann
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
89
320
29,602
Economics
Labor Economics
Population Economics
Migration
Manzoor Qadir
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
65
132
20,961
Unconventional water resources
water recycling and reuse
water quality and environmental health
water security
land degradat
Zhiming Liu
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
57
237
13,094
Computer Science
Software Engineering
HJ Gijzen
Metrics
H-Index
i10-Index
Citation Counts
51
110
9,276
biotechnology
microbiology
wastewater treatment
environmental engineering
pollution prevention and resource recovery
Dirk Messner
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
51
153
12,815
Sustainability Research
Digital Transformations
Global Governance
Climate Politics
Vladimir Smakhtin
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
49
118
13,748
Water
hydrology
floods
droughts
environmental flows
Gulab Singh
United Nations
New York, United States
Metrics
H-Index
i10-Index
Citation Counts
48
314
11,535
National Accounts
Official Statistics and Economics
Tony Addison
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
46
112
7,649
Oil and gas
Mining
Extractives
Aid
Poverty
Marwan Khawaja
United Nations
New York, United States
Metrics
H-Index
i10-Index
Citation Counts
41
58
4,352
demography
public health
collective action
social statistics
Zita Sebesvari
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
39
60
8,413
Disaster risk reduction and adptation
risk tipping points
ecosystem loss and damege
Enroll all your faculty members with discounted institutional membership to showcase your institution's academic strength to the world in the best way possible – join now and achieve results fast!
Shahbaz Khan
Metrics
H-Index
i10-Index
Citation Counts
39
111
9,317
Water
environment
irrigation
modeling
hydrology
Jamal Hisham Hashim
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
38
71
4,913
Anantha K. Duraiappah
Metrics
H-Index
i10-Index
Citation Counts
37
56
15,237
education
sustainable development
economics
Kees Van Der Geest
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
34
54
3,885
Human Mobility
Climate Mobility
Environmental Migration
Displacement
Loss and Damage
Bartel Van De Walle
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
34
90
5,365
Decision Support Systems
Crisis Response and Management
Policy Analysis
Francesc Pedró
Metrics
H-Index
i10-Index
Citation Counts
34
64
5,678
higher education policy
comparative education
educational technology
Andrea Hinwood
United Nations
New York, United States
Metrics
H-Index
i10-Index
Citation Counts
33
52
2,670
Foster Mcgregor Neil
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
32
71
4,382
Economic Development
International Economics
Srikantha Herath
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
32
68
4,551
Hydrology
Climate Change and Impacts
Urban Water
Disaster Risk Reduction
Numerical Modeling
Howard Steven Friedman
Metrics
H-Index
i10-Index
Citation Counts
32
64
4,747
Health Economics
Statistics
Data Science
Program Evaluation
Giovanni Stumpo
United Nations
New York, United States
Metrics
H-Index
i10-Index
Citation Counts
32
72
4,363
Ward Appeltans
Metrics
H-Index
i10-Index
Citation Counts
31
42
6,132
Sam Jones
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
30
51
3,951
Development Economics
Labour markets
Foreign Aid
Education
Mozambique
Kalman Kalotay
United Nations
New York, United States
Metrics
H-Index
i10-Index
Citation Counts
30
62
3,402
foreign direct investment
FDI
multinational enterprises
international business
Michael Enlocher
United Nations University
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
29
41
3,130
vulnerability
systemic risk
risk management
adaptation
hydrological extremes