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" (888,752 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: 1
Tsuyoshi Fujita(藤田壮)
circular economy
low carbon city
SDGs
Spatial Policy
Metrics
H-Index
i10 Index
Citation
73
213
18,886
* Rankings
Ranking Based On Selection: 4
Shamil Maksyutov
climate change
biogeochemistry
inverse modeling
data assimilation
remote sensing
Metrics
H-Index
i10 Index
Citation
55
176
16,137

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* Rankings
Ranking Based On Selection: 12
Guangyin Zhen
Bioenergy
Microbial electrolysis cell (MEC)
Sludge dewatering
Anaerobic digestion
Metrics
H-Index
i10 Index
Citation
48
101
8,354
* Rankings
Ranking Based On Selection: 20
Masao Uchida
Biogeochemistry
Analytical chemistry and technique
Paleoclimatology and Environmental Sciences
Metrics
H-Index
i10 Index
Citation
41
96
4,706
* Rankings
Ranking Based On Selection: 24
Satoshi Endo
Environmental chemistry
Contaminant transport
Partitioning
Sorption
Metrics
H-Index
i10 Index
Citation
38
66
6,005
* Rankings
Ranking Based On Selection: 28
Kei Sato
Atmospheric chemistry
Aerosol chemistry
Chemical kinetics
Metrics
H-Index
i10 Index
Citation
34
78
3,779
* Rankings
Ranking Based On Selection: 30
Kazuaki Syutsubo
Anaerobic digestion
Domestic wastewater
Microbial fuel cell
Microbial community analysis
Metrics
H-Index
i10 Index
Citation
32
57
4,475
* Rankings
Ranking Based On Selection: 33
Daisuke Goto
Atmospheric Science
Air quality
Atmospheric Chemistry
Climate
Aerosol Science
Metrics
H-Index
i10 Index
Citation
29
44
2,525
* Rankings
Ranking Based On Selection: 39
Tomohiro Tasaki
circular economy
sustainability science
Metrics
H-Index
i10 Index
Citation
23
40
2,639
* Rankings
Ranking Based On Selection: 41
Eric Dupuy
astrophysics
atmospheric physics
remote sensing
microwave
terahertz
Metrics
H-Index
i10 Index
Citation
23
32
1,506
* Rankings
Ranking Based On Selection: 42
Toshiaki Ichinose
Chinese environmental issues
GIS
energy system
urban climatology
urban environment system
Metrics
H-Index
i10 Index
Citation
22
34
2,935
* Rankings
Ranking Based On Selection: 44
Takashi Onodera
environmental engineering
wastewater treatment
stable isotope ratios
anaerobic digestion
Metrics
H-Index
i10 Index
Citation
21
27
1,593
* Rankings
Ranking Based On Selection: 47
Jiang Wu
Bioresources
Bioenergy recovery
Biological treatment
Metrics
H-Index
i10 Index
Citation
19
24
1,143
* Rankings
Ranking Based On Selection: 48
Takehiko I Hayashi
Science-policy interface
Causal inference
Environmental statistics
Risk analysis
Evolutionary ecology
Metrics
H-Index
i10 Index
Citation
19
33
1,178
* Rankings
Ranking Based On Selection: 56
Takahiro Kubo|久保雄広
Biodiversity economics
Environmental economics
Behaviour change
Conservation marketing
Metrics
H-Index
i10 Index
Citation
17
26
1,014
* Rankings
Ranking Based On Selection: 61
Shinichiro Asayama
climate change
geoengineering
carbon dioxide removal
science and technology studies
IPCC
Metrics
H-Index
i10 Index
Citation
17
19
846
* Rankings
Ranking Based On Selection: 62
池上 真木彦(Ikegami Makihiko)
Plant Ecology
Ecological modelling
Agriculture
Invasion Ecology
Biogeography
Metrics
H-Index
i10 Index
Citation
17
23
2,712
* Rankings
Ranking Based On Selection: 63
Naoki H Kumagai(熊谷直喜)
Ecology
Climate change
Ecological management
Macroecology
Marine biology
Metrics
H-Index
i10 Index
Citation
17
24
871
* Rankings
Ranking Based On Selection: 66
Keiichi Fukaya|深谷肇一
Statistical ecology
Population ecology
Community ecology
Biodiversity
Metrics
H-Index
i10 Index
Citation
16
21
927
* Rankings
Ranking Based On Selection: 67
Shuichi Ashina
統合評価モデル、エネルギー、低炭素シナリオ、地域循環共生圏
Metrics
H-Index
i10 Index
Citation
15
21
1,209
* Rankings
Ranking Based On Selection: 68
Yong Hu
biodegradation
waste & waste water treatment
Metrics
H-Index
i10 Index
Citation
15
19
879
* Rankings
Ranking Based On Selection: 83
Rintaro Yamaguchi
Macroeconomics
Environmental and Resource Economics
Sustainable Development
Discounting
Metrics
H-Index
i10 Index
Citation
12
14
401
* Rankings
Ranking Based On Selection: 85
Royston Uning
Atmospheric Chemistry
Air Pollution
Volatile Organic Compounds
Metrics
H-Index
i10 Index
Citation
11
13
439
* Rankings
Ranking Based On Selection: 86
Ryosuke Nakadai
Biodiversity science
Nature's contributions to people
Plant-herbivore interaction
Planetary
Metrics
H-Index
i10 Index
Citation
11
12
249
* Rankings
Ranking Based On Selection: 91
Tomohiro Okadera
Water-energy nexus
water footprints
water scarcity
Metrics
H-Index
i10 Index
Citation
10
13
809
* Rankings
Ranking Based On Selection: 92
Kyoshiro Hiki|日置恭史郎
Environmental toxicology
Ecological risk assessment
Sediment toxicology
Toxicogenomics
Amphipoda
Metrics
H-Index
i10 Index
Citation
10
11
600
* Rankings
Ranking Based On Selection: 93
Tomoki Morozumi
Biogeoscience
Chlorophyll Fluorescence
Carbon Cycle
Terrestrial Ecosystem
Remote Sensing of Vegetation
Metrics
H-Index
i10 Index
Citation
10
10
326
* Rankings
Ranking Based On Selection: 96
Yingchao Cheng
sewage sludge treatment
mercury emission control
artisanal and small-scale gold mining
Metrics
H-Index
i10 Index
Citation
9
9
284
* Rankings
Ranking Based On Selection: 98
Yuki Yoshida
human-nature relationships
environmental social sciences
socio-ecological production landscapes
Metrics
H-Index
i10 Index
Citation
9
9
736
Rankings
Ranking Based On Selection: 1
Tsuyoshi Fujita(藤田壮)
Metrics
H-Index
i10 Index
Citation Counts
73
213
18,886
circular economy
low carbon city
SDGs
Spatial Policy
Rankings
Ranking Based On Selection: 2
Nobuo Sugimoto
Metrics
H-Index
i10 Index
Citation Counts
62
201
16,101
atmospheric physics
laser remote sensing
Rankings
Ranking Based On Selection: 3
Naota Hanasaki
Metrics
H-Index
i10 Index
Citation Counts
61
119
21,322
Rankings
Ranking Based On Selection: 4
Shamil Maksyutov
Metrics
H-Index
i10 Index
Citation Counts
55
176
16,137
climate change
biogeochemistry
inverse modeling
data assimilation
remote sensing
Rankings
Ranking Based On Selection: 6
Kenichi Nakajima
Metrics
H-Index
i10 Index
Citation Counts
53
135
11,364
Rankings
Ranking Based On Selection: 7
Tomohiko Isobe
Metrics
H-Index
i10 Index
Citation Counts
53
127
12,027
Rankings
Ranking Based On Selection: 8
Isamu Morino
Metrics
H-Index
i10 Index
Citation Counts
52
141
12,722
Rankings
Ranking Based On Selection: 9
Seishiro Hirano
Metrics
H-Index
i10 Index
Citation Counts
52
136
9,642
Toxicology
Cell and Molecular Biology
Arsenic
PML
Macrophages
Rankings
Ranking Based On Selection: 10
Hiroshi Tanimoto
Metrics
H-Index
i10 Index
Citation Counts
50
137
8,974
Atmospheric Chemistry
Marine Chemistry
Air Pollution
Geochemistry

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Rankings
Ranking Based On Selection: 11
Atsushi Shimizu
Metrics
H-Index
i10 Index
Citation Counts
49
152
9,462
Rankings
Ranking Based On Selection: 12
Guangyin Zhen
Metrics
H-Index
i10 Index
Citation Counts
48
101
8,354
Bioenergy
Microbial electrolysis cell (MEC)
Sludge dewatering
Anaerobic digestion
Rankings
Ranking Based On Selection: 13
Nobuko Saigusa
Metrics
H-Index
i10 Index
Citation Counts
48
102
9,436
Rankings
Ranking Based On Selection: 14
Hitoshi Mukai
Metrics
H-Index
i10 Index
Citation Counts
46
131
8,596
Rankings
Ranking Based On Selection: 15
Yuichi Moriguchi
Metrics
H-Index
i10 Index
Citation Counts
44
94
8,659
Rankings
Ranking Based On Selection: 16
秋吉英治
Metrics
H-Index
i10 Index
Citation Counts
44
78
7,121
Rankings
Ranking Based On Selection: 17
Keisuke Nansai
Metrics
H-Index
i10 Index
Citation Counts
42
97
6,265
Rankings
Ranking Based On Selection: 18
Masanori Tamaoki
Metrics
H-Index
i10 Index
Citation Counts
42
72
6,301
Rankings
Ranking Based On Selection: 19
Hiroya Yamano
Metrics
H-Index
i10 Index
Citation Counts
41
115
6,803
Physical Geography
Coral Reefs
Coastal Geomorphology
Remote Sensing
Rankings
Ranking Based On Selection: 20
Masao Uchida
Metrics
H-Index
i10 Index
Citation Counts
41
96
4,706
Biogeochemistry
Analytical chemistry and technique
Paleoclimatology and Environmental Sciences
Rankings
Ranking Based On Selection: 21
Yasuaki Hijioka
Metrics
H-Index
i10 Index
Citation Counts
40
79
11,578
Rankings
Ranking Based On Selection: 22
Takuro Kobayashi
Metrics
H-Index
i10 Index
Citation Counts
39
68
4,260
Rankings
Ranking Based On Selection: 23
Yoshiaki Ishihara
Metrics
H-Index
i10 Index
Citation Counts
38
82
6,717
Rankings
Ranking Based On Selection: 24
Satoshi Endo
Metrics
H-Index
i10 Index
Citation Counts
38
66
6,005
Environmental chemistry
Contaminant transport
Partitioning
Sorption
Rankings
Ranking Based On Selection: 25
Masanobu Kawachi
Metrics
H-Index
i10 Index
Citation Counts
38
102
5,880
Rankings
Ranking Based On Selection: 26
Hideaki Nakajima
Metrics
H-Index
i10 Index
Citation Counts
38
136
6,136
Atmospheric Environment
Rankings
Ranking Based On Selection: 27
Qinxue Wang|Wang Q-X, Wang Q.
Metrics
H-Index
i10 Index
Citation Counts
36
103
4,489
Climate Change
Water Resource Management
Environmental Monitoring and Assessment
Rankings
Ranking Based On Selection: 28
Kei Sato
Metrics
H-Index
i10 Index
Citation Counts
34
78
3,779
Atmospheric chemistry
Aerosol chemistry
Chemical kinetics
Rankings
Ranking Based On Selection: 30
Kazuaki Syutsubo
Metrics
H-Index
i10 Index
Citation Counts
32
57
4,475
Anaerobic digestion
Domestic wastewater
Microbial fuel cell
Microbial community analysis
Rankings
Ranking Based On Selection: 31
Tatsuya Hanaoka
Metrics
H-Index
i10 Index
Citation Counts
31
52
3,502
Rankings
Ranking Based On Selection: 32
Yosuke Niwa
Metrics
H-Index
i10 Index
Citation Counts
29
51
12,949
Rankings
Ranking Based On Selection: 33
Daisuke Goto
Metrics
H-Index
i10 Index
Citation Counts
29
44
2,525
Atmospheric Science
Air quality
Atmospheric Chemistry
Climate
Aerosol Science
Rankings
Ranking Based On Selection: 34
Naishen Liang
Metrics
H-Index
i10 Index
Citation Counts
28
47
2,263
Forest
carbon cycle
soil respiration
photosynthesis
Rankings
Ranking Based On Selection: 35
Kazuya Nishina|仁科 一哉
Metrics
H-Index
i10 Index
Citation Counts
27
43
3,085
Rankings
Ranking Based On Selection: 36
Yoshifumi Masago
Metrics
H-Index
i10 Index
Citation Counts
27
42
2,832
Rankings
Ranking Based On Selection: 37
Akihiro Fushimi
Metrics
H-Index
i10 Index
Citation Counts
26
47
2,472
Rankings
Ranking Based On Selection: 38
Koichi Ohno
Metrics
H-Index
i10 Index
Citation Counts
25
34
2,307
Rankings
Ranking Based On Selection: 39
Tomohiro Tasaki
Metrics
H-Index
i10 Index
Citation Counts
23
40
2,639
circular economy
sustainability science
Rankings
Ranking Based On Selection: 40
Hisashi Yashiro
Metrics
H-Index
i10 Index
Citation Counts
23
34
2,077
Atmospheric Chemistry
High Performance Computing
Rankings
Ranking Based On Selection: 41
Eric Dupuy
Metrics
H-Index
i10 Index
Citation Counts
23
32
1,506
astrophysics
atmospheric physics
remote sensing
microwave
terahertz
Rankings
Ranking Based On Selection: 42
Toshiaki Ichinose
Metrics
H-Index
i10 Index
Citation Counts
22
34
2,935
Chinese environmental issues
GIS
energy system
urban climatology
urban environment system
Rankings
Ranking Based On Selection: 43
Takuro Kobashi
Metrics
H-Index
i10 Index
Citation Counts
21
24
1,787
Rankings
Ranking Based On Selection: 44
Takashi Onodera
Metrics
H-Index
i10 Index
Citation Counts
21
27
1,593
environmental engineering
wastewater treatment
stable isotope ratios
anaerobic digestion
Rankings
Ranking Based On Selection: 45
Jun Nishihiro
Metrics
H-Index
i10 Index
Citation Counts
21
37
1,488
Rankings
Ranking Based On Selection: 46
Julien Boulange
Metrics
H-Index
i10 Index
Citation Counts
20
30
2,241
Rankings
Ranking Based On Selection: 47
Jiang Wu
Metrics
H-Index
i10 Index
Citation Counts
19
24
1,143
Bioresources
Bioenergy recovery
Biological treatment
Rankings
Ranking Based On Selection: 48
Takehiko I Hayashi
Metrics
H-Index
i10 Index
Citation Counts
19
33
1,178
Science-policy interface
Causal inference
Environmental statistics
Risk analysis
Evolutionary ecology
Rankings
Ranking Based On Selection: 49
Yasuko Kameyama
Metrics
H-Index
i10 Index
Citation Counts
19
29
1,276
Rankings
Ranking Based On Selection: 50
Kanaya Gen
Metrics
H-Index
i10 Index
Citation Counts
19
29
1,139
Rankings
Ranking Based On Selection: 52
Yuji Masutomi
Metrics
H-Index
i10 Index
Citation Counts
18
25
1,072
Rankings
Ranking Based On Selection: 53
Hiroyuki Yokomizo
Metrics
H-Index
i10 Index
Citation Counts
18
35
1,763
Rankings
Ranking Based On Selection: 54
Hasi Bagan
Metrics
H-Index
i10 Index
Citation Counts
18
30
1,715
Rankings
Ranking Based On Selection: 55
Taku Umezawa
Metrics
H-Index
i10 Index
Citation Counts
18
23
941
Rankings
Ranking Based On Selection: 56
Takahiro Kubo|久保雄広
Metrics
H-Index
i10 Index
Citation Counts
17
26
1,014
Biodiversity economics
Environmental economics
Behaviour change
Conservation marketing
Rankings
Ranking Based On Selection: 57
Takuma Watari / 渡 卓磨|渡 卓磨
Metrics
H-Index
i10 Index
Citation Counts
17
20
1,765
Industrial Ecology
Energy System
Resource efficiency
Rankings
Ranking Based On Selection: 58
Zhaoling Li
Metrics
H-Index
i10 Index
Citation Counts
17
18
1,169
Rankings
Ranking Based On Selection: 59
Tomomi Inoue
Metrics
H-Index
i10 Index
Citation Counts
17
32
861
Aquatic Plants
Mangroves
Nitrogen
Plant ecophysiology
Rankings
Ranking Based On Selection: 60
Diego Silva Herran
Metrics
H-Index
i10 Index
Citation Counts
17
20
1,926
Rankings
Ranking Based On Selection: 61
Shinichiro Asayama
Metrics
H-Index
i10 Index
Citation Counts
17
19
846
climate change
geoengineering
carbon dioxide removal
science and technology studies
IPCC
Rankings
Ranking Based On Selection: 62
Plant Ecology
Ecological modelling
Agriculture
Invasion Ecology
Biogeography
Rankings
Ranking Based On Selection: 63
Naoki H Kumagai(熊谷直喜)
Metrics
H-Index
i10 Index
Citation Counts
17
24
871
Ecology
Climate change
Ecological management
Macroecology
Marine biology
Rankings
Ranking Based On Selection: 64
Yukio Terao
Metrics
H-Index
i10 Index
Citation Counts
17
22
801
Rankings
Ranking Based On Selection: 65
Kei Gomi
Metrics
H-Index
i10 Index
Citation Counts
16
24
1,532
Rankings
Ranking Based On Selection: 66
Keiichi Fukaya|深谷肇一
Metrics
H-Index
i10 Index
Citation Counts
16
21
927
Statistical ecology
Population ecology
Community ecology
Biodiversity
Rankings
Ranking Based On Selection: 67
Shuichi Ashina
Metrics
H-Index
i10 Index
Citation Counts
15
21
1,209
統合評価モデル、エネルギー、低炭素シナリオ、地域循環共生圏
Rankings
Ranking Based On Selection: 68
Yong Hu
Metrics
H-Index
i10 Index
Citation Counts
15
19
879
biodegradation
waste & waste water treatment
Rankings
Ranking Based On Selection: 70
Hibiki M Noda
Metrics
H-Index
i10 Index
Citation Counts
15
20
870
plant ecophysiology
vegetation remote sensing
Rankings
Ranking Based On Selection: 72
Fabian Christoph Fischer
Metrics
H-Index
i10 Index
Citation Counts
14
16
727
Rankings
Ranking Based On Selection: 73
Shuai Yin
Metrics
H-Index
i10 Index
Citation Counts
14
20
853
Rankings
Ranking Based On Selection: 74
Ryuichiro Shinohara
Metrics
H-Index
i10 Index
Citation Counts
14
19
586
phosphorus biogeochemistry
methane
eutrophication
Rankings
Ranking Based On Selection: 75
Fenjuan Wang
Metrics
H-Index
i10 Index
Citation Counts
14
19
652
Rankings
Ranking Based On Selection: 77
Kazuaki Tsuchiya
Metrics
H-Index
i10 Index
Citation Counts
13
17
1,323
Rankings
Ranking Based On Selection: 78
Hironori Toyama
Metrics
H-Index
i10 Index
Citation Counts
13
19
986
Rankings
Ranking Based On Selection: 79
Masaru Sakai
Metrics
H-Index
i10 Index
Citation Counts
13
18
552
Rankings
Ranking Based On Selection: 81
Dai Koide
Metrics
H-Index
i10 Index
Citation Counts
12
12
601
Climate Change
Species Distribution
Plant Ecology
Rankings
Ranking Based On Selection: 82
Haruko Ando
Metrics
H-Index
i10 Index
Citation Counts
12
16
600
Molecular Ecology
Conservation Biology
Island Biology
Rankings
Ranking Based On Selection: 83
Rintaro Yamaguchi
Metrics
H-Index
i10 Index
Citation Counts
12
14
401
Macroeconomics
Environmental and Resource Economics
Sustainable Development
Discounting
Rankings
Ranking Based On Selection: 84
Masato Ueshima
Metrics
H-Index
i10 Index
Citation Counts
12
12
1,363
Geomicrobiology
Waste Management
Hydrogeochemistry
Rankings
Ranking Based On Selection: 85
Royston Uning
Metrics
H-Index
i10 Index
Citation Counts
11
13
439
Atmospheric Chemistry
Air Pollution
Volatile Organic Compounds
Rankings
Ranking Based On Selection: 86
Ryosuke Nakadai
Metrics
H-Index
i10 Index
Citation Counts
11
12
249
Biodiversity science
Nature's contributions to people
Plant-herbivore interaction
Planetary
Rankings
Ranking Based On Selection: 87
Rajesh Janardanan
Metrics
H-Index
i10 Index
Citation Counts
11
15
506
Rankings
Ranking Based On Selection: 89
Masahide Nishihashi
Metrics
H-Index
i10 Index
Citation Counts
11
13
863
Rankings
Ranking Based On Selection: 90
Kiyoshi Satake
Metrics
H-Index
i10 Index
Citation Counts
11
12
337
Rankings
Ranking Based On Selection: 91
Tomohiro Okadera
Metrics
H-Index
i10 Index
Citation Counts
10
13
809
Water-energy nexus
water footprints
water scarcity
Rankings
Ranking Based On Selection: 92
Kyoshiro Hiki|日置恭史郎
Metrics
H-Index
i10 Index
Citation Counts
10
11
600
Environmental toxicology
Ecological risk assessment
Sediment toxicology
Toxicogenomics
Amphipoda
Rankings
Ranking Based On Selection: 93
Tomoki Morozumi
Metrics
H-Index
i10 Index
Citation Counts
10
10
326
Biogeoscience
Chlorophyll Fluorescence
Carbon Cycle
Terrestrial Ecosystem
Remote Sensing of Vegetation
Rankings
Ranking Based On Selection: 94
Yasuaki Akaji
Metrics
H-Index
i10 Index
Citation Counts
10
10
232
forest ecology
plant ecophysiology
microbial ecology
Rankings
Ranking Based On Selection: 95
Jort Hammer
Metrics
H-Index
i10 Index
Citation Counts
9
9
922
Environmental Toxicology
PFAS
Marine Environment
Ecotoxicology
Rankings
Ranking Based On Selection: 96
Yingchao Cheng
Metrics
H-Index
i10 Index
Citation Counts
9
9
284
sewage sludge treatment
mercury emission control
artisanal and small-scale gold mining
Rankings
Ranking Based On Selection: 97
Vera Phung Ling Hui
Metrics
H-Index
i10 Index
Citation Counts
9
8
372
Rankings
Ranking Based On Selection: 98
Yuki Yoshida
Metrics
H-Index
i10 Index
Citation Counts
9
9
736
human-nature relationships
environmental social sciences
socio-ecological production landscapes
Rankings
Ranking Based On Selection: 99
Kosuke Nakanishi
Metrics
H-Index
i10 Index
Citation Counts
9
8
261
Animal Ecology
Conservation Ecology
Freshwater Biology
Rankings
Ranking Based On Selection: 100
Yuko F Kitano
Metrics
H-Index
i10 Index
Citation Counts
9
9
371