Citation Rankings
Highly Cited Researchers
NASA Ames Research Center Highly Cited Researchers CitationNatural Sciences / Chemical Sciences Rankings 2025
The Citation Rankings (Highly Cited Researchers) 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.
* Total Citation Counts Rankings
Ranking Based On Selection :1
Atmospheric Chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
27,083
3,740
0.138
* Total Citation Counts Rankings
Ranking Based On Selection :2
chemistry
physics
astrochemistry
theoretical chemistry
spectroscopy
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
23,793
7,610
0.320
* Total Citation Counts Rankings
Ranking Based On Selection :3
atmospheric chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
19,735
4,509
0.228
* Total Citation Counts Rankings
Ranking Based On Selection :4
chemistry-climate interactions
trends in atmospheric pollutants
atmospheric chemistry modeling
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,532
5,625
0.534
* Total Citation Counts Rankings
Ranking Based On Selection :5
Astrochemistry
Chemistry
Astrobiology
Planetary Science
Radiation
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,085
2,486
0.274
* Total Citation Counts Rankings
Ranking Based On Selection :6
High temperature chemistry
chemical thermodynamics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,082
3,368
0.371
* Total Citation Counts Rankings
Ranking Based On Selection :7
Chemistry-Climate Modeling
Ozone
Stratospheric Chemistry
Volcanic Eruptions and Climate
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,942
5,045
0.564
* Total Citation Counts Rankings
Ranking Based On Selection :8
Ammonia
Air Quality
Tropospheric Chemistry
Chemical Ionization Mass Spectrometry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,326
3,888
0.467
* Total Citation Counts Rankings
Ranking Based On Selection :9
Astrobiology
Planetary Science
Analytical Chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,145
2,471
0.303
* Total Citation Counts Rankings
Ranking Based On Selection :10
Atmospheric Chemistry
Satellite Remote Sensing of Trace Gases
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,726
1,731
0.224
* Total Citation Counts Rankings
Ranking Based On Selection :11
Atmospheric Chemistry
Air Pollution
Remote Sensing
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,527
4,878
0.648
* Total Citation Counts Rankings
Ranking Based On Selection :12
Aerosol remote sensing
In-situ aerosol measurements
Tropopause chemistry & dynamics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,342
2,770
0.638
* Total Citation Counts Rankings
Ranking Based On Selection :13
planetary science
physical chemistry
physical properties of ices
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,570
2,076
0.582
* Total Citation Counts Rankings
Ranking Based On Selection :14
Atmospheric chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,377
2,484
0.736
* Total Citation Counts Rankings
Ranking Based On Selection :15
Atmospheric Chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,331
1,880
0.564
* Total Citation Counts Rankings
Ranking Based On Selection :16
Astrochemistry
Organic Chemistry
Natural Products
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,491
1,786
0.717
* Total Citation Counts Rankings
Ranking Based On Selection :17
Environmental chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,374
489
0.206
* Total Citation Counts Rankings
Ranking Based On Selection :18
Chemical Physics
Theoretical Chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,322
1,252
0.539
* Total Citation Counts Rankings
Ranking Based On Selection :19
Chemistry in the Solar System and planet-forming regions
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,995
1,179
0.591
* Total Citation Counts Rankings
Ranking Based On Selection :20
Laser ablation
LIBS
Plasma Physics
Analytical Chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,503
645
0.429
* Total Citation Counts Rankings
Ranking Based On Selection :21
surface engineering
thermal materials
bonding
structural composites
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,448
679
0.469
* Total Citation Counts Rankings
Ranking Based On Selection :22
chemistry
atmospheric sciences
quantum chemistry
astrochemistry
astrobiology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,375
839
0.610
* Total Citation Counts Rankings
Ranking Based On Selection :23
Atmospheric chemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,156
751
0.650
* Total Citation Counts Rankings
Ranking Based On Selection :24
Atmospheric Chemistry
In-situ measurements
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,036
957
0.924
* Total Citation Counts Rankings
Ranking Based On Selection :25
Chemistry
Physics
Spectroscopy
Plasmonics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,027
917
0.893
* Total Citation Counts Rankings
Rankings
26,026
11,925
50
Ranking Based On Selection: 1
Hanwant Singh
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
27,083
3,740
0.138
* Total Citation Counts Rankings
Rankings
31,602
14,282
65
Ranking Based On Selection: 2
Timothy J Lee
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
23,793
7,610
0.320
chemistry
physics
astrochemistry
theoretical chemistry
spectroscopy
* Total Citation Counts Rankings
Rankings
41,123
18,139
88
Ranking Based On Selection: 3
Stanley P Sander
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
19,735
4,509
0.228
* Total Citation Counts Rankings
Rankings
92,489
37,135
219
Ranking Based On Selection: 4
Sarah Strode
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,532
5,625
0.534
chemistry-climate interactions
trends in atmospheric pollutants
atmospheric chemistry modeling
* Total Citation Counts Rankings
Rankings
109,488
42,997
263
Ranking Based On Selection: 5
Perry Gerakines
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,085
2,486
0.274
Astrochemistry
Chemistry
Astrobiology
Planetary Science
Radiation
* Total Citation Counts Rankings
Rankings
109,514
43,005
264
Ranking Based On Selection: 6
Nathan Jacobson
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,082
3,368
0.371
High temperature chemistry
chemical thermodynamics
* Total Citation Counts Rankings
Rankings
111,444
43,681
271
Ranking Based On Selection: 7
Luke D Oman
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,942
5,045
0.564
Chemistry-Climate Modeling
Ozone
Stratospheric Chemistry
Volcanic Eruptions and Climate
* Total Citation Counts Rankings
Rankings
120,778
46,824
288
Ranking Based On Selection: 8
John B Nowak
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,326
3,888
0.467
Ammonia
Air Quality
Tropospheric Chemistry
Chemical Ionization Mass Spectrometry
* Total Citation Counts Rankings
Rankings
123,728
47,779
296
Ranking Based On Selection: 9
Peter A Willis
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,145
2,471
0.303
Astrobiology
Planetary Science
Analytical Chemistry
* Total Citation Counts Rankings
Rankings
131,138
50,243
310
Ranking Based On Selection: 10
James Gleason
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,726
1,731
0.224
Atmospheric Chemistry
Satellite Remote Sensing of Trace Gases
* Total Citation Counts Rankings
Rankings
134,863
51,475
316
Ranking Based On Selection: 11
Can Li
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,527
4,878
0.648
Atmospheric Chemistry
Air Pollution
Remote Sensing
* Total Citation Counts Rankings
Rankings
233,249
81,577
489
Ranking Based On Selection: 12
Leigh Munchak
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,342
2,770
0.638
Aerosol remote sensing
In-situ aerosol measurements
Tropopause chemistry & dynamics
* Total Citation Counts Rankings
Rankings
277,807
94,436
570
Ranking Based On Selection: 13
Mathieu Choukroun
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,570
2,076
0.582
planetary science
physical chemistry
physical properties of ices
* Total Citation Counts Rankings
Rankings
291,435
98,403
592
Ranking Based On Selection: 14
Katherine Travis
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,377
2,484
0.736
* Total Citation Counts Rankings
Rankings
294,871
99,392
599
Ranking Based On Selection: 15
Jin Liao
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,331
1,880
0.564
* Total Citation Counts Rankings
Rankings
373,387
121,299
706
Ranking Based On Selection: 16
José Carlos Aponte
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,491
1,786
0.717
Astrochemistry
Organic Chemistry
Natural Products
* Total Citation Counts Rankings
Rankings
387,511
125,136
723
Ranking Based On Selection: 17
William T Wallace
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,374
489
0.206
* Total Citation Counts Rankings
Rankings
393,930
126,893
731
Ranking Based On Selection: 18
E Papajak
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,322
1,252
0.539
Chemical Physics
Theoretical Chemistry
* Total Citation Counts Rankings
Rankings
440,274
139,481
802
Ranking Based On Selection: 19
Edith Fayolle
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,995
1,179
0.591
Chemistry in the Solar System and planet-forming regions
* Total Citation Counts Rankings
Rankings
533,833
164,293
924
Ranking Based On Selection: 20
Alexander A Bol'Shakov
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,503
645
0.429
Laser ablation
LIBS
Plasma Physics
Analytical Chemistry
* Total Citation Counts Rankings
Rankings
546,334
167,553
939
Ranking Based On Selection: 21
Frank L Palmieri
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,448
679
0.469
surface engineering
thermal materials
bonding
structural composites
* Total Citation Counts Rankings
Rankings
564,218
172,177
970
Ranking Based On Selection: 22
Partha P Bera
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,375
839
0.610
chemistry
atmospheric sciences
quantum chemistry
astrochemistry
astrobiology
* Total Citation Counts Rankings
Rankings
625,421
187,913
1,025
Ranking Based On Selection: 23
Travis N Knepp
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,156
751
0.650
* Total Citation Counts Rankings
Rankings
664,759
197,807
1,073
Ranking Based On Selection: 24
Hannah S Halliday
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,036
957
0.924
Atmospheric Chemistry
In-situ measurements
* Total Citation Counts Rankings
Rankings
667,846
198,580
1,078
Ranking Based On Selection: 25
Nicholas Tallarida
NASA Ames Research Center
California, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,027
917
0.893
Chemistry
Physics
Spectroscopy
Plasmonics