North America Scientist and University Rankings 2025
North America Medical and Health Sciences 358 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
Geriatrics and Gerontology
Metrics
H-Index
i10 Index
Citation Counts
272
1,662
409,464
* Total H IndexRankings
Ranking Based On Selection: 2
...diabetes
nutrition
nursing homes
frailty
alzheimers
Metrics
H-Index
i10 Index
Citation Counts
189
1,132
161,086
* Total H IndexRankings
Ranking Based On Selection: 3
metabolism
Metrics
H-Index
i10 Index
Citation Counts
153
565
96,547
* Total H IndexRankings
Ranking Based On Selection: 4
Aging and Caloric Restriction
Metrics
H-Index
i10 Index
Citation Counts
121
327
63,266
* Total H IndexRankings
Ranking Based On Selection: 5
Aging
Metrics
H-Index
i10 Index
Citation Counts
106
297
40,699
* Total H IndexRankings
Ranking Based On Selection: 6
health care research
geriatrics
Metrics
H-Index
i10 Index
Citation Counts
101
168
40,325
* Total H IndexRankings
Ranking Based On Selection: 7
physician patient communication
patient safety
outcomes based research
Metrics
H-Index
i10 Index
Citation Counts
97
291
44,197
* Total H IndexRankings
Ranking Based On Selection: 8
Aging
Metrics
H-Index
i10 Index
Citation Counts
97
213
43,781
* Total H IndexRankings
Ranking Based On Selection: 9
Alzheimer's disease
geriatrics
estrogen
Metrics
H-Index
i10 Index
Citation Counts
96
264
34,898
* Total H IndexRankings
Ranking Based On Selection: 10
geriatrics
drug therapy
adverse drug events
research integrity
Metrics
H-Index
i10 Index
Citation Counts
95
304
32,040
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* Total H IndexRankings
Ranking Based On Selection: 11
geriatric heart failure
multiple chronic conditions
Metrics
H-Index
i10 Index
Citation Counts
87
478
34,064
* Total H IndexRankings
Ranking Based On Selection: 12
geriatrics
dementia
frailty
falls
Metrics
H-Index
i10 Index
Citation Counts
87
246
41,883
* Total H IndexRankings
Ranking Based On Selection: 13
drug utilization
adverse drug events
aged
Metrics
H-Index
i10 Index
Citation Counts
86
228
36,279
* Total H IndexRankings
Ranking Based On Selection: 14
Neuroinflammation
Alzheimer's disease
Metrics
H-Index
i10 Index
Citation Counts
79
145
31,100
* Total H IndexRankings
Ranking Based On Selection: 15
Alzheimer's disease
Aging
Neuropsychology
Metrics
H-Index
i10 Index
Citation Counts
78
211
25,467
* Total H IndexRankings
Ranking Based On Selection: 16
affective neuroscience
aging
locus coeruleus-norepinephrine system
heart rate variability
Metrics
H-Index
i10 Index
Citation Counts
77
177
29,497
* Total H IndexRankings
Ranking Based On Selection: 17
aging
geriatrics
cardiovascular disease
quality improvement
health disparities
Metrics
H-Index
i10 Index
Citation Counts
75
204
20,673
* Total H IndexRankings
Ranking Based On Selection: 18
Depression
geriatrics
health services research
mixed methods
Metrics
H-Index
i10 Index
Citation Counts
73
193
24,018
* Total H IndexRankings
Ranking Based On Selection: 19
palliative care
geriatrics
multimorbidity
pain
quality of life
Metrics
H-Index
i10 Index
Citation Counts
71
287
20,553
* Total H IndexRankings
Ranking Based On Selection: 20
Gerontology
Epidemiology
Long-term Care
Metrics
H-Index
i10 Index
Citation Counts
70
132
17,915
* Total H IndexRankings
Ranking Based On Selection: 21
geriatric syndromes
incontinence
delirium
falls
osteoporosis
Metrics
H-Index
i10 Index
Citation Counts
69
157
19,251
* Total H IndexRankings
Ranking Based On Selection: 22
Aging
Geriatric Medicine
Gerontology
Geroscience
Metrics
H-Index
i10 Index
Citation Counts
67
184
17,340
* Total H IndexRankings
Ranking Based On Selection: 23
geriatrics
anxiety disorders
Metrics
H-Index
i10 Index
Citation Counts
67
132
16,571
* Total H IndexRankings
Ranking Based On Selection: 24
Metabolism
Muscle
Protein
Metrics
H-Index
i10 Index
Citation Counts
67
131
21,605
* Total H IndexRankings
Ranking Based On Selection: 25
Cancer
Aging
Supportive Care
Geriatrics
Medical Decision Making
Metrics
H-Index
i10 Index
Citation Counts
66
189
15,377
Luigi Ferrucci
National Institute on Aging
Bethesda, United States
Metrics
H-Index
i10-Index
Citation Counts
272
1,662
409,464
John Morley
Saint Louis University
St. Louis, United States
Metrics
H-Index
i10-Index
Citation Counts
189
1,132
161,086
...diabetes
nutrition
nursing homes
frailty
alzheimers
Robert R Wolfe
University of Arkansas for Medical Sciences
Little Rock, United States
Metrics
H-Index
i10-Index
Citation Counts
153
565
96,547
Rafael Carlos De Cabo|Rafael DeCabo, Rafael d Cabo, Rafa de Cabo
National Institute on Aging
Bethesda, United States
Metrics
H-Index
i10-Index
Citation Counts
121
327
63,266
Aging and Caloric Restriction
Pinchas Cohen
University of Southern California
Los Angeles, United States
Metrics
H-Index
i10-Index
Citation Counts
106
297
40,699
Seth Landefeld
University of Alabama Birmingham
Birmingham, United States
Metrics
H-Index
i10-Index
Citation Counts
101
168
40,325
health care research
geriatrics
Richard M Frankel
Metrics
H-Index
i10-Index
Citation Counts
97
291
44,197
physician patient communication
patient safety
outcomes based research
Vern Bengtson
University of Southern California
Los Angeles, United States
Metrics
H-Index
i10-Index
Citation Counts
97
213
43,781
Sanjay Asthana
Metrics
H-Index
i10-Index
Citation Counts
96
264
34,898
Alzheimer's disease
geriatrics
estrogen
Paula A Rochon
University of Toronto
Toronto, Canada
Metrics
H-Index
i10-Index
Citation Counts
95
304
32,040
geriatrics
drug therapy
adverse drug events
research integrity
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Ali Ahmed
US Veterans Affairs
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
87
478
34,064
geriatric heart failure
multiple chronic conditions
David B Hogan
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
87
246
41,883
geriatrics
dementia
frailty
falls
Joseph Hanlon
University of Pittsburgh
Pittsburgh, United States
Metrics
H-Index
i10-Index
Citation Counts
86
228
36,279
drug utilization
adverse drug events
aged
W Sue Griffin
University of Arkansas for Medical Sciences
Little Rock, United States
Metrics
H-Index
i10-Index
Citation Counts
79
145
31,100
Neuroinflammation
Alzheimer's disease
Belleville Sylvie
Université de Montréal
Montréal, Canada
Metrics
H-Index
i10-Index
Citation Counts
78
211
25,467
Alzheimer's disease
Aging
Neuropsychology
Mara Mather
University of Southern California
Los Angeles, United States
Metrics
H-Index
i10-Index
Citation Counts
77
177
29,497
affective neuroscience
aging
locus coeruleus-norepinephrine system
heart rate variability
Richard M Allman
George Washington University
Washington, United States
Metrics
H-Index
i10-Index
Citation Counts
75
204
20,673
aging
geriatrics
cardiovascular disease
quality improvement
health disparities
Joseph J Gallo
Johns Hopkins University
Baltimore, United States
Metrics
H-Index
i10-Index
Citation Counts
73
193
24,018
Depression
geriatrics
health services research
mixed methods
Christine Ritchie
Harvard University
Cambridge, United States
Metrics
H-Index
i10-Index
Citation Counts
71
287
20,553
palliative care
geriatrics
multimorbidity
pain
quality of life
Laura P Sands
Metrics
H-Index
i10-Index
Citation Counts
70
132
17,915
Gerontology
Epidemiology
Long-term Care
Neil Resnick
University of Pittsburgh
Pittsburgh, United States
Metrics
H-Index
i10-Index
Citation Counts
69
157
19,251
geriatric syndromes
incontinence
delirium
falls
osteoporosis
George A Kuchel
Metrics
H-Index
i10-Index
Citation Counts
67
184
17,340
Aging
Geriatric Medicine
Gerontology
Geroscience
Julie Wetherell
University of California San Diego
San Diego, United States
Metrics
H-Index
i10-Index
Citation Counts
67
132
16,571
Arny Ferrando
University of Arkansas for Medical Sciences
Little Rock, United States
Metrics
H-Index
i10-Index
Citation Counts
67
131
21,605
William Dale
Metrics
H-Index
i10-Index
Citation Counts
66
189
15,377
Cancer
Aging
Supportive Care
Geriatrics
Medical Decision Making