Citation Rankings
Highly Cited Researchers

Highly Cited Researchers 268 Scientists Citation Rankings (Sort by last 6 years Citation Index) - 2025

Discover the world’s highly cited researchers through the AD Scientific Index 2025 Citation Rankings.
These rankings evaluate scientists based on their total and recent citation counts, capturing the breadth and real-time currency of academic recognition. Citation data reveals how widely a scholar’s work is referenced, applied, and extended across diverse disciplines. The rankings are routinely updated to reflect ongoing citation growth, while eliminating distortions from excessive co-authorship and institutional inflation. Premium tools provide access to detailed citation dynamics, unethical citation behavior detection, and field-normalized benchmarking.

* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 1
Greece
Nicholas Apergis
Economic
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
34,787
21,516
0.619
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 2
Greece
Marianna Sigala
tourism
hospitality
services
marketing
digital technologie
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
26,694
17,618
0.660
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 3
Greece
Constantinos Patsakis
Cryptography
Computer Security
Privacy
Blockchain
Cybercrim
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,209
7,563
0.821
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 4
Greece
Thomas K Dasaklis
Supply Chain Management
Smart logistics
Blockchain
IoT
Humanitarian Logistic
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,778
5,363
0.928
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 5
Greece
Maria Virvou
Artificial Intelligence / Deep Learning
Software Technology
AI for Education
Human-AI Trus
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,976
5,128
0.514
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 6
Greece
Stefanos Gritzalis
Cybersecurity
Security
Information Security
Privacy
Data Protectio
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
11,843
4,848
0.409
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 7
Greece
Alexandros Flamos
Technoeconomics of Energy System
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,916
4,510
0.762
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 8
Greece
Demetrios Sampson
Learning Technologies
Technology Enhanced Learning
e-Learning
Adaptive Learning
Learning Analytic
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,211
4,239
0.415
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 9
Greece
Ilias Maglogiannis
Biomedical Informatics
Artificial Intelligence
Image Processing and Computer Vision
Multimedia
Sound Processin
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,158
4,225
0.416

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* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 10
Greece
Dimosthenis Kyriazis
Distributed Computing
Data Management & Analytics
Io
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,410
3,427
0.633
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 11
Greece
Alexandros-Apostolos A Boulogeorgos
Wireless Communications Theory
THz Communications
Wireless Security
Communications for Biomedica
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,963
3,405
0.859
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 12
Greece
Timmy Alepis
Informatics
Programming
Software
Application
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,415
3,284
0.744
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 13
Greece
Angeliki Alexiou
Wireless Systems
MIMO
Ultra Dense Networks
THz Communications
Reconfigurable Intelligent Surface
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,321
3,080
0.487
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 14
Greece
Christos Douligeris
Computer Network
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,538
3,150
0.330
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 15
Greece
Yannis Theodoridis
Data Science
Machine Learning
Spatial Databases
Mobility Data Scienc
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,101
3,060
0.203
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 16
Greece
Dimitris Apostolou
Knowledge management
Decision support
Group support systems
Recommender system
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,648
3,029
0.536
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 17
Greece
Panagiotis Demestichas
Telecommunications
Networks
Services
IC
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,130
2,540
0.356
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 18
Greece
Nikos Pelekis
Data mining
Database managemen
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,143
2,470
0.402
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 19
Greece
Athanasios Dagoumas
Energy Economics
Energy Policy
Energy Markets
Climate Polic
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,757
2,273
0.605
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 20
Greece
Dimitrios D Vergados
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,804
2,243
0.330
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 21
Greece
Panayiotis Kotzanikolaou
Security
Privacy
Cryptography
Critical Infrastructures
Critical Infrastructure Protectio
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,839
2,081
0.542
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 22
Greece
M Halkidi|Maria Halkidi
Data Mining
machine learning
recommender systems
distributed systems
data privac
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,337
2,047
0.246
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 23
Greece
Charalampos Konstantopoulos
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,624
2,008
0.434
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 24
Greece
George A Tsihrintzis
Computational Intelligence
Pattern Recognition
Artificial Intelligence
Signal Processing
Image Analysi
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,510
2,015
0.447
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection: 25
Greece
Athanasios G Kanatas
Wireless and Satellite Communication
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,104
1,865
0.454
* Last 6 Years Citation Counts Rankings
Rankings
11,328
Greece
67
1
Ranking Based On Selection: 1
Nicholas Apergis
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
34,787
21,516
0.619
* Last 6 Years Citation Counts Rankings
Rankings
15,230
Greece
83
2
Ranking Based On Selection: 2
Marianna Sigala
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
26,694
17,618
0.660
tourism
hospitality
services
marketing
digital technologie
* Last 6 Years Citation Counts Rankings
Rankings
53,253
Greece
260
3
Ranking Based On Selection: 3
Constantinos Patsakis
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,209
7,563
0.821
Cryptography
Computer Security
Privacy
Blockchain
Cybercrim
* Last 6 Years Citation Counts Rankings
Rankings
85,009
Greece
426
4
Ranking Based On Selection: 4
Thomas K Dasaklis
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,778
5,363
0.928
Supply Chain Management
Smart logistics
Blockchain
IoT
Humanitarian Logistic
* Last 6 Years Citation Counts Rankings
Rankings
89,999
Greece
467
5
Ranking Based On Selection: 5
Maria Virvou
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,976
5,128
0.514
Artificial Intelligence / Deep Learning
Software Technology
AI for Education
Human-AI Trus
* Last 6 Years Citation Counts Rankings
Rankings
96,753
Greece
520
6
Ranking Based On Selection: 6
Stefanos Gritzalis
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
11,843
4,848
0.409
Cybersecurity
Security
Information Security
Privacy
Data Protectio
* Last 6 Years Citation Counts Rankings
Rankings
105,880
Greece
595
7
Ranking Based On Selection: 7
Alexandros Flamos
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,916
4,510
0.762
* Last 6 Years Citation Counts Rankings
Rankings
114,128
Greece
643
8
Ranking Based On Selection: 8
Demetrios Sampson
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,211
4,239
0.415
Learning Technologies
Technology Enhanced Learning
e-Learning
Adaptive Learning
Learning Analytic
* Last 6 Years Citation Counts Rankings
Rankings
114,565
Greece
644
9
Ranking Based On Selection: 9
Ilias Maglogiannis
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,158
4,225
0.416
Biomedical Informatics
Artificial Intelligence
Image Processing and Computer Vision
Multimedia
Sound Processin
* Last 6 Years Citation Counts Rankings
Rankings
146,754
Greece
861
10
Ranking Based On Selection: 10
Dimosthenis Kyriazis
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,410
3,427
0.633

Smart Institutional Plan

Powerful Insights + Smart Membership = Institutional Success
Unlock 360° Real-Time Institutional Analysis to identify your institution’s strengths and areas for improvement.

* Last 6 Years Citation Counts Rankings
Rankings
147,852
Greece
872
11
Ranking Based On Selection: 11
Alexandros-Apostolos A Boulogeorgos
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,963
3,405
0.859
Wireless Communications Theory
THz Communications
Wireless Security
Communications for Biomedica
* Last 6 Years Citation Counts Rankings
Rankings
154,182
Greece
929
12
Ranking Based On Selection: 12
Timmy Alepis
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,415
3,284
0.744
Informatics
Programming
Software
Application
* Last 6 Years Citation Counts Rankings
Rankings
165,812
Greece
1,021
14
Ranking Based On Selection: 13
Angeliki Alexiou
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,321
3,080
0.487
Wireless Systems
MIMO
Ultra Dense Networks
THz Communications
Reconfigurable Intelligent Surface
* Last 6 Years Citation Counts Rankings
Rankings
161,669
Greece
979
13
Ranking Based On Selection: 14
Christos Douligeris
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,538
3,150
0.330
* Last 6 Years Citation Counts Rankings
Rankings
166,946
Greece
1,032
15
Ranking Based On Selection: 15
Yannis Theodoridis
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,101
3,060
0.203
Data Science
Machine Learning
Spatial Databases
Mobility Data Scienc
* Last 6 Years Citation Counts Rankings
Rankings
168,909
Greece
1,051
16
Ranking Based On Selection: 16
Dimitris Apostolou
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
5,648
3,029
0.536
Knowledge management
Decision support
Group support systems
Recommender system
* Last 6 Years Citation Counts Rankings
Rankings
204,632
Greece
1,293
17
Ranking Based On Selection: 17
Panagiotis Demestichas
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,130
2,540
0.356
* Last 6 Years Citation Counts Rankings
Rankings
210,787
Greece
1,333
18
Ranking Based On Selection: 18
Nikos Pelekis
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,143
2,470
0.402
* Last 6 Years Citation Counts Rankings
Rankings
229,798
Greece
1,491
19
Ranking Based On Selection: 19
Athanasios Dagoumas
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,757
2,273
0.605
Energy Economics
Energy Policy
Energy Markets
Climate Polic
* Last 6 Years Citation Counts Rankings
Rankings
232,999
Greece
1,518
20
Ranking Based On Selection: 20
Dimitrios D Vergados
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,804
2,243
0.330
* Last 6 Years Citation Counts Rankings
Rankings
251,418
Greece
1,668
21
Ranking Based On Selection: 21
Panayiotis Kotzanikolaou
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,839
2,081
0.542
Security
Privacy
Cryptography
Critical Infrastructures
Critical Infrastructure Protectio
* Last 6 Years Citation Counts Rankings
Rankings
255,449
Greece
1,698
22
Ranking Based On Selection: 22
M Halkidi|Maria Halkidi
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,337
2,047
0.246
Data Mining
machine learning
recommender systems
distributed systems
data privac
* Last 6 Years Citation Counts Rankings
Rankings
260,321
Greece
1,741
24
Ranking Based On Selection: 23
Charalampos Konstantopoulos
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,624
2,008
0.434
* Last 6 Years Citation Counts Rankings
Rankings
259,434
Greece
1,732
23
Ranking Based On Selection: 24
George A Tsihrintzis
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,510
2,015
0.447
Computational Intelligence
Pattern Recognition
Artificial Intelligence
Signal Processing
Image Analysi
* Last 6 Years Citation Counts Rankings
Rankings
279,899
Greece
1,903
25
Ranking Based On Selection: 25
Athanasios G Kanatas
       Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,104
1,865
0.454