Citation Rankings
Highly Cited Researchers
Highly Cited Researchers 49 Scientists Citation Rankings (Sort by last 6 years Citation Index) - 2025
The Citation Rankings (Highly Cited Researchers) list highlight the most cited and influential researchers across a vast range of scientific fields, covering 197 main and sub-disciplines, including the Art and Humanities Citation Rankings and Social Sciences and Humanities Citation Rankings. This service, offered exclusively by AD Scientific Index, aims to provide a balanced perspective by excluding data from CERN and other statistical sources that disproportionately favor certain researchers, particularly in the social sciences and humanities. This unique approach addresses the advantages researchers with multi-author publications and CERN involvement hold over others. Furthermore, citation rankings help uncover rule violations and unethical practices within the research community. For more detailed citation analyses, explore the Scientists Last 6 Years Citation Index, Universities Total Citations Rankings 2025, and Universities Last 6 Years Citations Rankings 2025.
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 1
Neuropsychiatry and Neuropharmacology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,172
2,071
0.953
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 2
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,867
723
0.387
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 3
PD/Pain/Neuroendoc/Neurostress/neurotox
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
537
534
0.994
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 4
Community Health intervention - NCDs
Adolescent Reproductive Health
Infection prevention & control
Nursing Research & Educati
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
522
434
0.831
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 5
Cardiovascular Physiology
Endothelia cell physiology
Respiratory physiology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
394
391
0.992
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 6
Endocrinology/Reproduction
Blood
Exercise Physiology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
342
291
0.851
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 7
PARASITOLOGY
MICROBIOLOGY AND PUBLIC HEALTH
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
317
227
0.716
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 8
CHEMICAL PATHOLOGY
LABORATORY ANDROLOGY
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
223
219
0.982
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 9
Gastrointestinal Physiology
Neuro-Physiology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
269
189
0.703
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 10
Environmental toxicology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
195
180
0.923
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 11
Neglected Tropical Diseases
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
162
155
0.957
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 12
Neuroendocrine Pharmacology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
146
144
0.986
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 13
Gastroenterology and Hepatology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
624
134
0.215
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 14
Membràne and Medical Biochemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
222
118
0.532
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 15
toxicology
pharmacology
endocrinology and chemical pathology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
136
103
0.757
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 16
Cancer Research
Chemotherapy
Cancer Epigenetics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
99
99
1.000
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 17
Sequential extration method
bioaccessibility
mineralogy
trace elements
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
94
89
0.947
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 18
Medical and Pharmacological Biochemistry
Endocrinology
Toxicology
Ethnomedicine
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
113
85
0.752
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 19
Medical & Clinical Biochemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
80
80
1.000
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 20
Environmental physiology
Exercise physiology
Neuroscience
Reproductive physiology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
69
69
1.000
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 21
Exercise and cardiovascular physiology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
61
61
1.000
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 22
Neuroscience Toxicology Forensic Anatomy Diabetes Studies Developmental Biology Genetics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
114
60
0.526
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 23
Nutritional Biochemistry/Toxicology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
91
55
0.604
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 24
Public Health
Medicine/medical sciences
Environmental
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
68
46
0.676
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 25
Microbiology/Parasitology/Public Health
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
60
46
0.767
* Last 6 Years Citation Counts Rankings
Rankings
232,094
360
1
Ranking Based On Selection: 1
Benneth Ben-Azu
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,172
2,071
0.953
Neuropsychiatry and Neuropharmacology
* Last 6 Years Citation Counts Rankings
Rankings
559,881
1,840
2
Ranking Based On Selection: 2
Ngozi Nma Odu
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,867
723
0.387
* Last 6 Years Citation Counts Rankings
Rankings
672,452
2,970
3
Ranking Based On Selection: 3
Olusegun Gafar Adebayo
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
537
534
0.994
* Last 6 Years Citation Counts Rankings
Rankings
755,570
4,025
4
Ranking Based On Selection: 4
Eunice Osuala
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
522
434
0.831
Community Health intervention - NCDs
Adolescent Reproductive Health
Infection prevention & control
Nursing Research & Educati
* Last 6 Years Citation Counts Rankings
Rankings
800,178
4,663
5
Ranking Based On Selection: 5
Asiwe Jerome Ndudi
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
394
391
0.992
Cardiovascular Physiology
Endothelia cell physiology
Respiratory physiology
* Last 6 Years Citation Counts Rankings
Rankings
930,985
6,731
6
Ranking Based On Selection: 6
Tolunigba Abisola Kolawole
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
342
291
0.851
Endocrinology/Reproduction
Blood
Exercise Physiology
* Last 6 Years Citation Counts Rankings
Rankings
1,046,603
8,807
7
Ranking Based On Selection: 7
Clement Nyenke
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
317
227
0.716
PARASITOLOGY
MICROBIOLOGY AND PUBLIC HEALTH
* Last 6 Years Citation Counts Rankings
Rankings
1,064,381
9,161
8
Ranking Based On Selection: 8
Fyneface Chikadibia Amadi
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
223
219
0.982
CHEMICAL PATHOLOGY
LABORATORY ANDROLOGY
* Last 6 Years Citation Counts Rankings
Rankings
1,133,807
10,510
9
Ranking Based On Selection: 9
Elizabeth Bassey Umoren
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
269
189
0.703
Gastrointestinal Physiology
Neuro-Physiology
* Last 6 Years Citation Counts Rankings
Rankings
1,158,166
11,007
10
Ranking Based On Selection: 10
Emmanuel Modo
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
195
180
0.923
* Last 6 Years Citation Counts Rankings
Rankings
1,230,061
12,557
11
Ranking Based On Selection: 11
Onosakponome E|ONOSAKPONOME EVELYN OREVAOGHENE, E.O. ONOSAKPONDME
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
162
155
0.957
Neglected Tropical Diseases
* Last 6 Years Citation Counts Rankings
Rankings
1,265,380
13,335
12
Ranking Based On Selection: 12
Ajirioghene Akpotu
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
146
144
0.986
Neuroendocrine Pharmacology
* Last 6 Years Citation Counts Rankings
Rankings
1,297,158
14,087
13
Ranking Based On Selection: 13
Anele Ihekwaba
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
624
134
0.215
Gastroenterology and Hepatology
* Last 6 Years Citation Counts Rankings
Rankings
1,357,807
15,456
14
Ranking Based On Selection: 14
Okon Etim
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
222
118
0.532
Membràne and Medical Biochemistry
* Last 6 Years Citation Counts Rankings
Rankings
1,421,503
16,936
15
Ranking Based On Selection: 15
Okolonkwo Benjamin Nnamdi
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
136
103
0.757
toxicology
pharmacology
endocrinology and chemical pathology
* Last 6 Years Citation Counts Rankings
Rankings
1,442,046
17,445
16
Ranking Based On Selection: 16
Bubaraye Uko
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
99
99
1.000
Cancer Research
Chemotherapy
Cancer Epigenetics
* Last 6 Years Citation Counts Rankings
Rankings
1,488,529
18,626
17
Ranking Based On Selection: 17
Patrick M. Amaibi
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
94
89
0.947
Sequential extration method
bioaccessibility
mineralogy
trace elements
* Last 6 Years Citation Counts Rankings
Rankings
1,507,696
19,083
18
Ranking Based On Selection: 18
Utibe Evans Bassey
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
113
85
0.752
Medical and Pharmacological Biochemistry
Endocrinology
Toxicology
Ethnomedicine
* Last 6 Years Citation Counts Rankings
Rankings
1,536,381
19,827
19
Ranking Based On Selection: 19
Anthony Chibuzor Nnamudi
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
80
80
1.000
Medical & Clinical Biochemistry
* Last 6 Years Citation Counts Rankings
Rankings
1,598,782
21,436
20
Ranking Based On Selection: 20
Rejoice Buduburisi
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
69
69
1.000
Environmental physiology
Exercise physiology
Neuroscience
Reproductive physiology
* Last 6 Years Citation Counts Rankings
Rankings
1,649,172
22,759
21
Ranking Based On Selection: 21
Idara Asuquo Okon
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
61
61
1.000
* Last 6 Years Citation Counts Rankings
Rankings
1,651,164
22,799
22
Ranking Based On Selection: 22
Helen Bassey Akpan
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
114
60
0.526
Neuroscience Toxicology Forensic Anatomy Diabetes Studies Developmental Biology Genetics
* Last 6 Years Citation Counts Rankings
Rankings
1,685,330
23,742
23
Ranking Based On Selection: 23
Ekam Akpakpan|Ekam Ime Akpakpan
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
91
55
0.604
Nutritional Biochemistry/Toxicology
* Last 6 Years Citation Counts Rankings
Rankings
1,752,146
25,649
24
Ranking Based On Selection: 24
Nnenna Ihua
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
68
46
0.676
Public Health
Medicine/medical sciences
Environmental
* Last 6 Years Citation Counts Rankings
Rankings
1,752,795
25,676
25
Ranking Based On Selection: 25
Okafor Roseanne Adah
PAMO University of Medical Sciences
Port-Harcourt, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
60
46
0.767
Microbiology/Parasitology/Public Health