Top 100 Scientists

World Top 100 Scientists 2025

Top 100 scientists can be ranked globally or specific to the following regions including Africa, Asia, Europe, North America, Latin America, Oceania, Arab League, ASEAN, EECA, and BRICS based on total H-index scores without any breakdown by subject areas. Top 100 rankings in the world, in a continent, or a region include standardized subjects areas of Agriculture & Forestry, Arts, Design and Architecture, Business & Management, Economics & Econometrics, Education, Engineering & Technology, History, Philosophy, Theology, Law/Law and Legal Studies, Medical and Health Sciences, Natural Sciences, Social Sciences, Art and Humanities Rankings and Social Sciences and Humanities Rankings BETA VERSION. Subject field ranking in world, region, country and university is beta version since subject field "others" (873,864 scientists profile whose branch cannot be determined, not yet edited or determined) is excluded, so the ranking will change as the others fields are edited. Please note that. Subjects indicated as “ * others ” will not be included in the ranking by regions and subjects.

* Rankings
Ranking Based On Selection :2
Sigurður Snorrason
Developmental Biology
Evolutionary Ecology
Animal Behaviour
Metrics
H-Index
i10 Index
Citation
38
65
4,856
* Rankings
Ranking Based On Selection :3
Snæbjörn Pálsson
Evolutionary biology
population genetics
molecular ecology
Metrics
H-Index
i10 Index
Citation
33
79
5,495
* Rankings
Ranking Based On Selection :4
Gisli Mar Gislason
Stream communities
ecosystem ecology
population dynamics
dispersal
island biogeography
Metrics
H-Index
i10 Index
Citation
33
68
4,337
* Rankings
Ranking Based On Selection :5
Tómas Grétar Gunnarsson
ecology
habitats
conservation
migratory populations
waders/shorebirds
Metrics
H-Index
i10 Index
Citation
30
51
3,765
* Rankings
Ranking Based On Selection :7
Deanne Bird
Disaster risk reduction
climate change adaptation
Metrics
H-Index
i10 Index
Citation
27
43
3,857
* Rankings
Ranking Based On Selection :8
Rannveig Olafsdottir
Environmental management
environmental planning
sustainable tourism
sustainable tourism indicators
tourism and climate chang
Metrics
H-Index
i10 Index
Citation
26
45
2,764
* Rankings
Ranking Based On Selection :10
Arnthor Gardarsson
conservation biology
ecology
seabirds
limnology
ornithology
Metrics
H-Index
i10 Index
Citation
25
45
1,867
* Rankings
Ranking Based On Selection :11
Asa L Aradottir
Ecological restoration
birch woodlands
succession
ecosystem services
carbon sequestration
Metrics
H-Index
i10 Index
Citation
24
37
1,878
* Rankings
Ranking Based On Selection :12
Filipa Samarra
Behavioural Ecology
Animal Behaviour
Bioacoustics
Metrics
H-Index
i10 Index
Citation
23
40
2,478
* Rankings
Ranking Based On Selection :13
Egill Erlendsson
Palynology
climate
soil erosion
archaeology
vegetation
Metrics
H-Index
i10 Index
Citation
23
31
1,254
* Rankings
Ranking Based On Selection :14
Valborg Gudmundsdottir
proteomics
genomics
systems biology
data integration
type 2 diabetes
Metrics
H-Index
i10 Index
Citation
22
25
6,177
* Rankings
Ranking Based On Selection :15
Einar Árnason
Population genetics
population genomics
molecular evolution
biometry
Metrics
H-Index
i10 Index
Citation
22
32
1,683
* Rankings
Ranking Based On Selection :16
Arnar Palsson
Population genetics
quantitative genetics
transcriptional evolution
transcriptional cooption
Metrics
H-Index
i10 Index
Citation
21
25
5,720
* Rankings
Ranking Based On Selection :18
Bradley A Thayer
international politics
international security
conflict
offensive realism
evolution and international politics
Metrics
H-Index
i10 Index
Citation
21
35
2,241
* Rankings
Ranking Based On Selection :19
Gunnsteinn Haraldsson
General microbiology
molecular microbiology
molecular typing
molecular epidemiology
microbial ecology.
Metrics
H-Index
i10 Index
Citation
19
28
1,981
* Rankings
Ranking Based On Selection :22
Guðbjörg Ásta Ólafsdóttir
Behavioral ecology
evolutionary ecology
fish biology
Metrics
H-Index
i10 Index
Citation
13
16
701
* Rankings
Ranking Based On Selection :24
Ellen Gunnarsdottir
Molecular Anthropology
Evolutionary Genetics
Ancient DNA
Metrics
H-Index
i10 Index
Citation
10
10
1,132
* Rankings
Ranking Based On Selection :25
Hafdís Hanna Ægisdóttir
ecological restoration
plant ecology
science communication
education for sustainability
Metrics
H-Index
i10 Index
Citation
9
8
382
* Rankings
Ranking Based On Selection :26
Kevin Dillman
Sustainability
Ecological Economics
Industrial Ecology
Sustainable Consumption
Life Cycle Assessment
Metrics
H-Index
i10 Index
Citation
8
8
388
* Rankings
Ranking Based On Selection :27
Emmanuel Pagneux
Recreational ecology
Flood & volcanic risks
risk governance
risk perception
GIS applied to the Disaster Risk Management cycl
Metrics
H-Index
i10 Index
Citation
8
7
342
* Rankings
Ranking Based On Selection :28
Hildur Magnúsdóttir
Parasite Diversity
Co-Evolution
Marine Ecology
Marine Invertebrate Zoology
Malacology
Metrics
H-Index
i10 Index
Citation
6
4
92
* Rankings
Ranking Based On Selection :30
Hermann Dreki Guls
Marine ecotoxicology
marine invertebrates
marine biology
Metrics
H-Index
i10 Index
Citation
5
2
77
* Rankings
Ranking Based On Selection :34
Ian E Klupar
tundra ecology
biogeochemistry
herbivory
fire
carbon cycle
Metrics
H-Index
i10 Index
Citation
3
2
197
* Rankings
Ranking Based On Selection :35
Laura Barbero Palacios
Zoogeochemistry
Biogeochemistry
Ecology
Zoology
Wildlife Conservation and Management
Metrics
H-Index
i10 Index
Citation
3
0
12
Rankings
Ranking Based On Selection: 1
Brynhildur Davidsdottir
Metrics
H-Index
i10 Index
Citation Counts
43
120
8,437
Rankings
Ranking Based On Selection: 2
Sigurður Snorrason
Metrics
H-Index
i10 Index
Citation Counts
38
65
4,856
Developmental Biology
Evolutionary Ecology
Animal Behaviour
Rankings
Ranking Based On Selection: 3
Snæbjörn Pálsson
Metrics
H-Index
i10 Index
Citation Counts
33
79
5,495
Evolutionary biology
population genetics
molecular ecology
Rankings
Ranking Based On Selection: 4
Gisli Mar Gislason
Metrics
H-Index
i10 Index
Citation Counts
33
68
4,337
Stream communities
ecosystem ecology
population dynamics
dispersal
island biogeography
Rankings
Ranking Based On Selection: 5
Tómas Grétar Gunnarsson
Metrics
H-Index
i10 Index
Citation Counts
30
51
3,765
ecology
habitats
conservation
migratory populations
waders/shorebirds
Rankings
Ranking Based On Selection: 6
Arni Einarsson
Metrics
H-Index
i10 Index
Citation Counts
29
60
2,907
Rankings
Ranking Based On Selection: 7
Deanne Bird
Metrics
H-Index
i10 Index
Citation Counts
27
43
3,857
Disaster risk reduction
climate change adaptation
Rankings
Ranking Based On Selection: 8
Rannveig Olafsdottir
Metrics
H-Index
i10 Index
Citation Counts
26
45
2,764
Environmental management
environmental planning
sustainable tourism
sustainable tourism indicators
tourism and climate chang
Rankings
Ranking Based On Selection: 9
Valgerdur Andrésdóttir
Metrics
H-Index
i10 Index
Citation Counts
25
40
2,125
Rankings
Ranking Based On Selection: 10
Arnthor Gardarsson
Metrics
H-Index
i10 Index
Citation Counts
25
45
1,867
conservation biology
ecology
seabirds
limnology
ornithology
Rankings
Ranking Based On Selection: 11
Asa L Aradottir
Metrics
H-Index
i10 Index
Citation Counts
24
37
1,878
Ecological restoration
birch woodlands
succession
ecosystem services
carbon sequestration
Rankings
Ranking Based On Selection: 12
Filipa Samarra
Metrics
H-Index
i10 Index
Citation Counts
23
40
2,478
Behavioural Ecology
Animal Behaviour
Bioacoustics
Rankings
Ranking Based On Selection: 13
Egill Erlendsson
Metrics
H-Index
i10 Index
Citation Counts
23
31
1,254
Palynology
climate
soil erosion
archaeology
vegetation
Rankings
Ranking Based On Selection: 14
Valborg Gudmundsdottir
Metrics
H-Index
i10 Index
Citation Counts
22
25
6,177
proteomics
genomics
systems biology
data integration
type 2 diabetes
Rankings
Ranking Based On Selection: 15
Einar Árnason
Metrics
H-Index
i10 Index
Citation Counts
22
32
1,683
Population genetics
population genomics
molecular evolution
biometry
Rankings
Ranking Based On Selection: 16
Arnar Palsson
Metrics
H-Index
i10 Index
Citation Counts
21
25
5,720
Population genetics
quantitative genetics
transcriptional evolution
transcriptional cooption
Rankings
Ranking Based On Selection: 17
Petur Henry Petersen
Metrics
H-Index
i10 Index
Citation Counts
21
23
1,906
Rankings
Ranking Based On Selection: 18
Bradley A Thayer
Metrics
H-Index
i10 Index
Citation Counts
21
35
2,241
international politics
international security
conflict
offensive realism
evolution and international politics
Rankings
Ranking Based On Selection: 19
Gunnsteinn Haraldsson
Metrics
H-Index
i10 Index
Citation Counts
19
28
1,981
General microbiology
molecular microbiology
molecular typing
molecular epidemiology
microbial ecology.
Rankings
Ranking Based On Selection: 20
Jón Einar Jónsson
Metrics
H-Index
i10 Index
Citation Counts
18
31
961
Rankings
Ranking Based On Selection: 21
Gunnar Thor Hallgrimsson
Metrics
H-Index
i10 Index
Citation Counts
17
23
934
Rankings
Ranking Based On Selection: 22
Guðbjörg Ásta Ólafsdóttir
Metrics
H-Index
i10 Index
Citation Counts
13
16
701
Behavioral ecology
evolutionary ecology
fish biology
Rankings
Ranking Based On Selection: 23
Reynir Smari Atlason
Metrics
H-Index
i10 Index
Citation Counts
11
13
452
Rankings
Ranking Based On Selection: 24
Ellen Gunnarsdottir
Metrics
H-Index
i10 Index
Citation Counts
10
10
1,132
Molecular Anthropology
Evolutionary Genetics
Ancient DNA
Rankings
Ranking Based On Selection: 25
Hafdís Hanna Ægisdóttir
Metrics
H-Index
i10 Index
Citation Counts
9
8
382
ecological restoration
plant ecology
science communication
education for sustainability
Rankings
Ranking Based On Selection: 26
Kevin Dillman
Metrics
H-Index
i10 Index
Citation Counts
8
8
388
Sustainability
Ecological Economics
Industrial Ecology
Sustainable Consumption
Life Cycle Assessment
Rankings
Ranking Based On Selection: 27
Emmanuel Pagneux
Metrics
H-Index
i10 Index
Citation Counts
8
7
342
Recreational ecology
Flood & volcanic risks
risk governance
risk perception
GIS applied to the Disaster Risk Management cycl
Rankings
Ranking Based On Selection: 28
Hildur Magnúsdóttir
Metrics
H-Index
i10 Index
Citation Counts
6
4
92
Parasite Diversity
Co-Evolution
Marine Ecology
Marine Invertebrate Zoology
Malacology
Rankings
Ranking Based On Selection: 29
Josh Nightingale
Metrics
H-Index
i10 Index
Citation Counts
5
3
90
Rankings
Ranking Based On Selection: 30
Hermann Dreki Guls
Metrics
H-Index
i10 Index
Citation Counts
5
2
77
Marine ecotoxicology
marine invertebrates
marine biology
Rankings
Ranking Based On Selection: 31
Ingvild Ryde
Metrics
H-Index
i10 Index
Citation Counts
4
3
56
Rankings
Ranking Based On Selection: 32
Kevin Ostacolo
Metrics
H-Index
i10 Index
Citation Counts
4
2
60
Rankings
Ranking Based On Selection: 33
Quentin Horta-Lacueva
Metrics
H-Index
i10 Index
Citation Counts
4
1
58
Rankings
Ranking Based On Selection: 34
Ian E Klupar
Metrics
H-Index
i10 Index
Citation Counts
3
2
197
tundra ecology
biogeochemistry
herbivory
fire
carbon cycle
Rankings
Ranking Based On Selection: 35
Laura Barbero Palacios
Metrics
H-Index
i10 Index
Citation Counts
3
0
12
Zoogeochemistry
Biogeochemistry
Ecology
Zoology
Wildlife Conservation and Management
Rankings
Ranking Based On Selection: 36
Jonathan Rempel
Metrics
H-Index
i10 Index
Citation Counts
3
2
63