University, Subject, Country, Region, World
US Environmental Protection Agency 64 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 31, 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
Molecular Microbial Ecology
drinking water
microbial ecology
environmental microbiology
water
Metrics
H-Index
i10 Index
Citation Counts
61
131
10,120
* Total H IndexRankings
Ranking Based On Selection: 2
developmental biology
Metrics
H-Index
i10 Index
Citation Counts
58
130
14,249
* Total H IndexRankings
Ranking Based On Selection: 3
aquatic ecology
fluvial geomorphology
hydrology
physical habitat
Metrics
H-Index
i10 Index
Citation Counts
55
92
10,121
* Total H IndexRankings
Ranking Based On Selection: 4
environmental microbiology
microbial ecology
regenerative system design
Metrics
H-Index
i10 Index
Citation Counts
54
125
13,640
* Total H IndexRankings
Ranking Based On Selection: 5
neurotoxicology
developmental toxicology
chemical screening
zebrafish
Metrics
H-Index
i10 Index
Citation Counts
53
108
10,477
* Total H IndexRankings
Ranking Based On Selection: 6
biology
Metrics
H-Index
i10 Index
Citation Counts
51
109
15,881
* Total H IndexRankings
Ranking Based On Selection: 7
freshwater ecology
biogeochemistry
acidification
Metrics
H-Index
i10 Index
Citation Counts
51
77
15,545
* Total H IndexRankings
Ranking Based On Selection: 8
Nitrogen cycling
Phosphorus cycling
watersheds
Metrics
H-Index
i10 Index
Citation Counts
43
77
7,767
* Total H IndexRankings
Ranking Based On Selection: 9
landscape ecology
aquatic ecology
watershed modeling
spatial analysis
hydrological connectivity
Metrics
H-Index
i10 Index
Citation Counts
42
67
5,822
* Total H IndexRankings
Ranking Based On Selection: 10
Wetland Ecology
Systems Ecology
Landscape Ecology
Watershed Management
Metrics
H-Index
i10 Index
Citation Counts
41
76
5,450
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* Total H IndexRankings
Ranking Based On Selection: 11
wetland ecology
climate adaptation
eutrophication
salt marshes
Metrics
H-Index
i10 Index
Citation Counts
39
67
4,607
* Total H IndexRankings
Ranking Based On Selection: 12
ecosystem restoration
urban ecology
nitrogen
animal behavior
Metrics
H-Index
i10 Index
Citation Counts
38
77
6,376
* Total H IndexRankings
Ranking Based On Selection: 13
non-perennial streams
headwaters
connectivity
invertebrates
disturbance
Metrics
H-Index
i10 Index
Citation Counts
38
65
5,025
* Total H IndexRankings
Ranking Based On Selection: 14
Ecology
Nitrogen Deposition
Biofuels
Climate Change
Metrics
H-Index
i10 Index
Citation Counts
33
48
8,231
* Total H IndexRankings
Ranking Based On Selection: 15
Aquatic ecology
Metrics
H-Index
i10 Index
Citation Counts
32
64
3,401
* Total H IndexRankings
Ranking Based On Selection: 16
Estuarine Ecology
Metrics
H-Index
i10 Index
Citation Counts
30
41
5,671
* Total H IndexRankings
Ranking Based On Selection: 17
ecological risk assessment
Metrics
H-Index
i10 Index
Citation Counts
30
53
6,304
* Total H IndexRankings
Ranking Based On Selection: 18
Conservation Biology
Landscape Ecology
Metrics
H-Index
i10 Index
Citation Counts
29
52
4,514
* Total H IndexRankings
Ranking Based On Selection: 19
ecology
watershed modeling
mercury exposure and bioaccumulation
Metrics
H-Index
i10 Index
Citation Counts
27
44
3,096
* Total H IndexRankings
Ranking Based On Selection: 20
Ecological Risk Assessment
Population Modeling
Aquatic Toxicology
Metrics
H-Index
i10 Index
Citation Counts
27
54
2,412
* Total H IndexRankings
Ranking Based On Selection: 21
fresh water ecology
large scale assessment
monitoring
Metrics
H-Index
i10 Index
Citation Counts
27
39
3,701
* Total H IndexRankings
Ranking Based On Selection: 22
Estuarine Ecology
Benthic Invertebrates
Environmental Indicators
Metrics
H-Index
i10 Index
Citation Counts
27
39
2,238
* Total H IndexRankings
Ranking Based On Selection: 23
Systems Ecology
Biogeochemistry
Ecotoxicology
Stream Ecology
Nutrient Management
Metrics
H-Index
i10 Index
Citation Counts
26
40
4,490
* Total H IndexRankings
Ranking Based On Selection: 24
Seagrass ecophysiology
Estuarine ecology
Stable Isotope Ecology
Metrics
H-Index
i10 Index
Citation Counts
24
35
2,026
* Total H IndexRankings
Ranking Based On Selection: 25
habitat modeling
landscape ecology
ecotoxicology
conservation ecology
Metrics
H-Index
i10 Index
Citation Counts
24
34
2,154
Jorge W Santo Domingo
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
61
131
10,120
Molecular Microbial Ecology
drinking water
microbial ecology
environmental microbiology
water
Thomas B Knudsen
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
58
130
14,249
Philip R Kaufmann|Philip Robert Kaufmann, P.R. Kaufmann
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
55
92
10,121
aquatic ecology
fluvial geomorphology
hydrology
physical habitat
Jay Garland
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
54
125
13,640
environmental microbiology
microbial ecology
regenerative system design
Stephanie Padilla
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
53
108
10,477
neurotoxicology
developmental toxicology
chemical screening
zebrafish
James Lazorchak
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
51
109
15,881
John L Stoddard
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
51
77
15,545
freshwater ecology
biogeochemistry
acidification
Jana Compton
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
43
77
7,767
Nitrogen cycling
Phosphorus cycling
watersheds
Scott G Leibowitz
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
42
67
5,822
landscape ecology
aquatic ecology
watershed modeling
spatial analysis
hydrological connectivity
Charles R Lane
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
41
76
5,450
Wetland Ecology
Systems Ecology
Landscape Ecology
Watershed Management
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!
Cathleen Wigand
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
39
67
4,607
wetland ecology
climate adaptation
eutrophication
salt marshes
Paul Mayer
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
38
77
6,376
ecosystem restoration
urban ecology
nitrogen
animal behavior
Ken Fritz
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
38
65
5,025
non-perennial streams
headwaters
connectivity
invertebrates
disturbance
Christopher M Clark
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
33
48
8,231
Ecology
Nitrogen Deposition
Biofuels
Climate Change
Theodore R Angradi
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
32
64
3,401
James D. Hagy III
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
30
41
5,671
Glenn Suter
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
30
53
6,304
Nathan Schumaker
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
29
52
4,514
Conservation Biology
Landscape Ecology
John Johnston
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
27
44
3,096
ecology
watershed modeling
mercury exposure and bioaccumulation
Sandy Raimondo
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
27
54
2,412
Ecological Risk Assessment
Population Modeling
Aquatic Toxicology
Steve Paulsen
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
27
39
3,701
fresh water ecology
large scale assessment
monitoring
Marguerite Pelletier
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
27
39
2,238
Estuarine Ecology
Benthic Invertebrates
Environmental Indicators
Christopher Nietch
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
26
40
4,490
Systems Ecology
Biogeochemistry
Ecotoxicology
Stream Ecology
Nutrient Management
James E Kaldy
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
24
35
2,026
Seagrass ecophysiology
Estuarine ecology
Stable Isotope Ecology
Anne Kuhn
US Environmental Protection Agency
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
24
34
2,154
habitat modeling
landscape ecology
ecotoxicology
conservation ecology