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Top 100 Scientists

World Top 100 Scientists 2026

The Top 100 scientists are ranked based on total H-index scores at the global, regional, national, and institutional levels. Rankings cover 10 regions, 13 main fields, and 221 subfields. Subject field rankings (at world, region, country, and university levels) are currently in Beta version and updated in near real-time.
Note: Researchers classified as "others" (currently 1,122,060 profiles whose fields are undetermined or unedited) are excluded from subject and regional rankings. These rankings will dynamically evolve as the “others” profiles are reviewed and properly categorized.

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Total 2.308 scientist
* Total H Index Rankings

Rankings

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4,632
World Rank
China
165
Country Rank
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences Logo
1
University
Ranking Based On Selection:
1
Xian-Hua Li/李献华
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences Wushan, China
Engineering & Technology / Petroleum Engineering
Geochronology | Geochemistry | Petrology | Chemical geodynamic

H-Index Metrics

  • H-Index
    122
  • i10 Index
    336
  • Citation Counts
    58,184
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* Total H Index Rankings

Rankings

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4,929
World Rank
Hong Kong
52
Country Rank
University of Hong Kong Logo
10
University
Ranking Based On Selection:
2
Mei Fu Zhou
University of Hong Kong Pokfulam, Hong Kong
Engineering & Technology / Petroleum Engineering
Igneous Petrology | Economic Geology | Ore Deposit

H-Index Metrics

  • H-Index
    121
  • i10 Index
    387
  • Citation Counts
    47,417
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* Total H Index Rankings

Rankings

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9,077
World Rank
United Kingdom
799
Country Rank
University of Oxford Logo
119
University
Ranking Based On Selection:
3
Bernard J Wood
University of Oxford Oxford, United Kingdom
Engineering & Technology / Petroleum Engineering
element partitioning | planetary accretion | volcanic gases | experimental petrolog

H-Index Metrics

  • H-Index
    103
  • i10 Index
    246
  • Citation Counts
    32,516
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* Total H Index Rankings

Rankings

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9,699
World Rank
United States
4,345
Country Rank
University of Texas Austin Logo
32
University
Ranking Based On Selection:
4
Mukul Sharma
University of Texas Austin Austin, United States
Engineering & Technology / Petroleum Engineering
petroleum engineering | hydraulic fracturing | formation damage | water injection | production engineerin

H-Index Metrics

  • H-Index
    101
  • i10 Index
    619
  • Citation Counts
    40,346
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* Total H Index Rankings

Rankings

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10,862
World Rank
United States
4,814
Country Rank
Carnegie Institution for Science Logo
4
University
Ranking Based On Selection:
5
Robert M Hazen
Carnegie Institution for Science Washington, United States
Engineering & Technology / Petroleum Engineering
mineralogy | astrobiology | astrochemistry | petrolog

H-Index Metrics

  • H-Index
    98
  • i10 Index
    350
  • Citation Counts
    34,740
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* Total H Index Rankings

Rankings

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12,253
World Rank
United States
5,429
Country Rank
Massachusetts Institute of Technology Logo
122
University
Ranking Based On Selection:
6
Timothy Grove
Massachusetts Institute of Technology Cambridge, United States
Engineering & Technology / Petroleum Engineering
Igneous petrology | Experimental Petrology | Geochemistry | Mineralog

H-Index Metrics

  • H-Index
    95
  • i10 Index
    217
  • Citation Counts
    32,715
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* Total H Index Rankings

Rankings

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12,572
World Rank
Germany
618
Country Rank
Goethe University Frankfurt Logo
10
University
Ranking Based On Selection:
7
Axel Gerdes
Goethe University Frankfurt Frankfurt, Germany
Engineering & Technology / Petroleum Engineering
Geochronology | Isotope Geochemistry | LA-ICP-MS | Laser ablation ICP-MS | Petrolog

H-Index Metrics

  • H-Index
    94
  • i10 Index
    389
  • Citation Counts
    34,584
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* Total H Index Rankings

Rankings

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12,974
World Rank
China
588
Country Rank
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences Logo
4
University
Ranking Based On Selection:
8
Yi-Gang Xu
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences Wushan, China
Engineering & Technology / Petroleum Engineering
Igneous petrology/geochemistry | Lithospheric mantle | Large igneous provinces | Big mantle Wedge | Earth's habitabilit

H-Index Metrics

  • H-Index
    94
  • i10 Index
    324
  • Citation Counts
    32,726
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* Total H Index Rankings

Rankings

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14,717
World Rank
Canada
614
Country Rank
University of Alberta Logo
39
University
Ranking Based On Selection:
9
DG Pearson
University of Alberta Edmonton, Canada
Engineering & Technology / Petroleum Engineering
Isotope Geochemistry | Re-Os isotopes | Mantle Petrolog

H-Index Metrics

  • H-Index
    90
  • i10 Index
    362
  • Citation Counts
    30,410
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* Total H Index Rankings

Rankings

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14,887
World Rank
United States
6,550
Country Rank
University of Texas Austin Logo
63
University
Ranking Based On Selection:
10
Gary A Pope
University of Texas Austin Austin, United States
Engineering & Technology / Petroleum Engineering
petroleum engineering | reservoir engineering | enhanced oil recovery | reservoir simulatio

H-Index Metrics

  • H-Index
    90
  • i10 Index
    376
  • Citation Counts
    29,572
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* Total H Index Rankings

Rankings

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16,565
World Rank
United States
7,239
Country Rank
University of Kentucky Logo
14
University
Ranking Based On Selection:
11
James C Hower
University of Kentucky Lexington, United States
Engineering & Technology / Petroleum Engineering
coal petrology | fly ash petrology | coal geochemistry | coal maceral origin

H-Index Metrics

  • H-Index
    87
  • i10 Index
    445
  • Citation Counts
    28,181
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* Total H Index Rankings

Rankings

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17,348
World Rank
United States
7,547
Country Rank
University of Texas Austin Logo
74
University
Ranking Based On Selection:
12
Kamy Sepehrnoori
University of Texas Austin Austin, United States
Engineering & Technology / Petroleum Engineering
Petroleum Engineering | Reservoir Simulatio

H-Index Metrics

  • H-Index
    86
  • i10 Index
    463
  • Citation Counts
    27,928
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* Total H Index Rankings

Rankings

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18,496
World Rank
China
876
Country Rank
Dalian University of Technology Logo
9
University
Ranking Based On Selection:
13
Xudong Zhao
Dalian University of Technology Dalian, China
Engineering & Technology / Petroleum Engineering
Switched systems | Fuzzy systems | Markovian jump systems | Delay systems | Robust contro

H-Index Metrics

  • H-Index
    84
  • i10 Index
    382
  • Citation Counts
    25,914
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* Total H Index Rankings

Rankings

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21,502
World Rank
Australia
1,030
Country Rank
Curtin University Logo
22
University
Ranking Based On Selection:
14
Andrew Putnis
Curtin University Bentley, Australia
Engineering & Technology / Petroleum Engineering
Mineralogy | Geochemistry | Petrolog

H-Index Metrics

  • H-Index
    81
  • i10 Index
    274
  • Citation Counts
    24,145
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* Total H Index Rankings

Rankings

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23,054
World Rank
China
1,122
Country Rank
Peking University Logo
40
University
Ranking Based On Selection:
15
Zhijun Jin(金之钧)
Peking University Beijing, China
Engineering & Technology / Petroleum Engineering
Petroleum Geolog

H-Index Metrics

  • H-Index
    79
  • i10 Index
    633
  • Citation Counts
    29,485
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* Total H Index Rankings

Rankings

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24,786
World Rank
China
1,198
Country Rank
Southwest Petroleum University Logo
1
University
Ranking Based On Selection:
16
Ying Zhou
Southwest Petroleum University Nanchong, China
Engineering & Technology / Petroleum Engineering
Energy and materials | Oil and gas utilizatio

H-Index Metrics

  • H-Index
    77
  • i10 Index
    239
  • Citation Counts
    17,435
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* Total H Index Rankings

Rankings

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24,808
World Rank
Germany
1,174
Country Rank
GeoForschungsZentrum Potsdam Logo
3
University
Ranking Based On Selection:
17
Zhi Yang
GeoForschungsZentrum Potsdam , Germany
Engineering & Technology / Petroleum Engineering
Peteoleum Geolog

H-Index Metrics

  • H-Index
    77
  • i10 Index
    370
  • Citation Counts
    25,042
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* Total H Index Rankings

Rankings

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24,840
World Rank
China
1,211
Country Rank
Northeast Petroleum University Logo
2
University
Ranking Based On Selection:
18
Dong Li(李栋)
Northeast Petroleum University Daqing, China
Engineering & Technology / Petroleum Engineering
heat transfer | solar energy | optical properties | building | cf

H-Index Metrics

  • H-Index
    77
  • i10 Index
    490
  • Citation Counts
    25,456
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* Total H Index Rankings

Rankings

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25,108
World Rank
United States
10,628
Country Rank
University of Houston Logo
27
University
Ranking Based On Selection:
19
SM Farouq Ali
University of Houston Houston, United States
Engineering & Technology / Petroleum Engineering
Petroleum Engineerin

H-Index Metrics

  • H-Index
    77
  • i10 Index
    469
  • Citation Counts
    25,904
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* Total H Index Rankings

Rankings

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25,232
World Rank
Australia
1,236
Country Rank
Queensland University of Technology Logo
36
University
Ranking Based On Selection:
20
Balz Kamber
Queensland University of Technology Brisbane, Australia
Engineering & Technology / Petroleum Engineering
Earth Sciences | Geochemistry | Astrobiolog

H-Index Metrics

  • H-Index
    77
  • i10 Index
    181
  • Citation Counts
    24,951
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* Total H Index Rankings

Rankings

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25,409
World Rank
United States
10,750
Country Rank
University of Texas Austin Logo
108
University
Ranking Based On Selection:
21
Larry Lake
University of Texas Austin Austin, United States
Engineering & Technology / Petroleum Engineering
reservoir engineering | enhanced oil recovery | petroleum engineerin

H-Index Metrics

  • H-Index
    77
  • i10 Index
    275
  • Citation Counts
    27,221
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* Total H Index Rankings

Rankings

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26,738
World Rank
Canada
1,151
Country Rank
University of Calgary Logo
57
University
Ranking Based On Selection:
22
Gerrit Voordouw
University of Calgary Calgary, Canada
Engineering & Technology / Petroleum Engineering
Petroleum Microbiology | Sulfate-reducing bacteri

H-Index Metrics

  • H-Index
    76
  • i10 Index
    215
  • Citation Counts
    17,661
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* Total H Index Rankings

Rankings

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29,648
World Rank
China
1,466
Country Rank
Southwest Petroleum University Logo
2
University
Ranking Based On Selection:
23
Hui Zhang
Southwest Petroleum University Nanchong, China
Engineering & Technology / Petroleum Engineering

H-Index Metrics

  • H-Index
    73
  • i10 Index
    248
  • Citation Counts
    16,593
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* Total H Index Rankings

Rankings

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31,859
World Rank
Canada
1,403
Country Rank
University of Alberta Logo
102
University
Ranking Based On Selection:
24
Murray Gray
University of Alberta Edmonton, Canada
Engineering & Technology / Petroleum Engineering
heavy oil | interfacial science | chemical reactors | biochemical reactor

H-Index Metrics

  • H-Index
    72
  • i10 Index
    251
  • Citation Counts
    16,322
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* Total H Index Rankings

Rankings

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32,662
World Rank
United States
13,486
Country Rank
University of Texas Austin Logo
150
University
Ranking Based On Selection:
25
Kishore Mohanty
University of Texas Austin Austin, United States
Engineering & Technology / Petroleum Engineering
petroleum engineering | chemical engineerin

H-Index Metrics

  • H-Index
    71
  • i10 Index
    254
  • Citation Counts
    16,403
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