World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 47 3992 3664 1561 1385 131 8759

Kirk R. Johnson publications per year

The chart shows the history of publications by Kirk R. Johnson between 1983 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Kirk R. Johnson published across 43 years, from 1983 to 2025, averaging 3.6 papers a year. Output peaked at 17 publications in 2002. 2 of the 154 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1983 to 2025. Vertical axis: number of publications, 0 to 17. Peak 17 publications in 2002. 1983: 1 publication 1984: 1 publication 1985: 0 publications 1986: 1 publication 1987: 3 publications 1988: 2 publications 1989: 2 publications 1990: 2 publications 1991: 0 publications 1992: 1 publication 1993: 2 publications 1994: 0 publications 1995: 0 publications 1996: 1 publication 1997: 1 publication 1998: 2 publications 1999: 3 publications 2000: 2 publications 2001: 6 publications 2002: 17 publications 2003: 8 publications 2004: 4 publications 2005: 4 publications 2006: 1 publication 2007: 10 publications 2008: 16 publications 2009: 3 publications 2010: 7 publications 2011: 5 publications 2012: 1 publication 2013: 3 publications 2014: 10 publications 2015: 4 publications 2016: 9 publications 2017: 2 publications 2018: 1 publication 2019: 9 publications 2020: 2 publications 2021: 1 publication 2022: 3 publications 2023: 2 publications 2024: 0 publications 2025: 2 publications
1983 2025

154 publications in total across all disciplines

View publications per year as a table
Kirk R. Johnson: publications per year, 1983 to 2025
Year Publications
1983 1
1984 1
1985 0
1986 1
1987 3
1988 2
1989 2
1990 2
1991 0
1992 1
1993 2
1994 0
1995 0
1996 1
1997 1
1998 2
1999 3
2000 2
2001 6
2002 17
2003 8
2004 4
2005 4
2006 1
2007 10
2008 16
2009 3
2010 7
2011 5
2012 1
2013 3
2014 10
2015 4
2016 9
2017 2
2018 1
2019 9
2020 2
2021 1
2022 3
2023 2
2024 0
2025 2
Total 154
Download as CSV

Kirk R. Johnson publications per year - data summary

  • Kirk R. Johnson, a Earth Science scholar from National Museum of Natural History, has 154 publications recorded across 43 years, from 1983 to 2025.
  • The oldest publication on record dates to 1983 and the most recent to 2025.
  • The most productive year is 2002, with 17 publications.
  • The least productive years with any output are 1983, 1984, 1986, 1992 and others, with 1 publication each.
  • 5 of the 43 years in the span carry no publications at all (1985, 1991, 1994, 1995 and others).
  • The rate of publication averages 3.6 papers per year over the whole span, or 4.1 per year counting only the 38 years with at least one publication.
  • The last 5 years on the chart (2021-2025) hold 8 publications, 5% of the career total.
  • Split into equal eras - 1983-1997: 17 publications (1.1 per year); 1998-2012: 89 publications (5.9 per year); 2013-2025: 48 publications (3.7 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Kirk R. Johnson publication distribution in Earth Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Earth Science in 2026. The highlighted bar marks where Kirk R. Johnson sits on this spectrum.

No. of scientists
100 200 300 400 500
Bar chart with 58 bars. Horizontal axis: publications, 38–47 to 603+. Vertical axis: number of scientists, 0 to 557. Most scientists, 557, have 128–137 publications. The last bar groups every scientist with 603 publications or more. The highlighted bar, 128–137 publications, is where this scientist sits. 38–47 publications: 5 scientists 48–57 publications: 33 scientists 58–67 publications: 94 scientists 68–77 publications: 161 scientists 78–87 publications: 278 scientists 88–97 publications: 376 scientists 98–107 publications: 404 scientists 108–117 publications: 484 scientists 118–127 publications: 540 scientists 128–137 publications: 557 scientists 138–147 publications: 491 scientists 148–157 publications: 495 scientists 158–167 publications: 458 scientists 168–177 publications: 490 scientists 178–187 publications: 414 scientists 188–197 publications: 401 scientists 198–207 publications: 333 scientists 208–217 publications: 292 scientists 218–227 publications: 290 scientists 228–237 publications: 262 scientists 238–247 publications: 243 scientists 248–257 publications: 208 scientists 258–267 publications: 185 scientists 268–277 publications: 147 scientists 278–287 publications: 128 scientists 288–297 publications: 119 scientists 298–307 publications: 120 scientists 308–317 publications: 107 scientists 318–327 publications: 93 scientists 328–337 publications: 87 scientists 338–347 publications: 64 scientists 348–357 publications: 87 scientists 358–367 publications: 60 scientists 368–377 publications: 60 scientists 378–387 publications: 34 scientists 388–397 publications: 50 scientists 398–407 publications: 44 scientists 408–417 publications: 31 scientists 418–427 publications: 39 scientists 428–437 publications: 27 scientists 438–447 publications: 36 scientists 448–457 publications: 27 scientists 458–467 publications: 29 scientists 468–477 publications: 30 scientists 478–487 publications: 19 scientists 488–497 publications: 15 scientists 498–507 publications: 18 scientists 508–517 publications: 19 scientists 518–527 publications: 16 scientists 528–537 publications: 10 scientists 538–547 publications: 11 scientists 548–557 publications: 14 scientists 558–567 publications: 11 scientists 568–577 publications: 7 scientists 578–587 publications: 14 scientists 588–597 publications: 5 scientists 598–602 publications: 4 scientists 603+ publications: 100 scientists
38–47 publications 603+

This scientist: 131 publications — 28th percentile

28% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 603 publications or more.

View publications distribution as a table
Number of Earth Science scientists by publication count, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
Publications Scientists This scientist
38–47 5
48–57 33
58–67 94
68–77 161
78–87 278
88–97 376
98–107 404
108–117 484
118–127 540
128–137 557 131
138–147 491
148–157 495
158–167 458
168–177 490
178–187 414
188–197 401
198–207 333
208–217 292
218–227 290
228–237 262
238–247 243
248–257 208
258–267 185
268–277 147
278–287 128
288–297 119
298–307 120
308–317 107
318–327 93
328–337 87
338–347 64
348–357 87
358–367 60
368–377 60
378–387 34
388–397 50
398–407 44
408–417 31
418–427 39
428–437 27
438–447 36
448–457 27
458–467 29
468–477 30
478–487 19
488–497 15
498–507 18
508–517 19
518–527 16
528–537 10
538–547 11
548–557 14
558–567 11
568–577 7
578–587 14
588–597 5
598–602 4
603+ 100
Download as CSV

Kirk R. Johnson publication distribution in Earth Science in 2026 - data summary

  • The chart plots the publication count of all 9,176 Earth Science scientists ranked by Research.com in 2026, grouped into 58 ranges running from 38–47 to 603+ publications.
  • Kirk R. Johnson, a Earth Science scholar from National Museum of Natural History, records 131 publications - the 28th percentile of the discipline.
  • 28% of ranked Earth Science scientists score the same or lower than Kirk R. Johnson, and about 72% score higher.
  • The median of the discipline falls in the 168–177 publications range, and Kirk R. Johnson ranks below the median.
  • The most crowded range is 128–137 publications, holding 557 scientists (6% of the field).
  • 58% of the field sits in the lowest quarter of the value range (up to 178–187 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 603 publications or more, 100 scientists in all (1% of the field).

Kirk R. Johnson D-index placement in Earth Science in 2026

The chart shows the D-index (discipline H-index) distribution of Earth Science scientists ranked by Research.com in 2026. The highlighted bar marks where Kirk R. Johnson sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 77 bars. Horizontal axis: D-Index, 30 to 106+. Vertical axis: number of scientists, 0 to 389. Most scientists, 389, have 36 D-Index. The last bar groups every scientist with 106 D-Index or more. The highlighted bar, 47 D-Index, is where this scientist sits. 30 D-Index: 144 scientists 31 D-Index: 215 scientists 32 D-Index: 278 scientists 33 D-Index: 379 scientists 34 D-Index: 366 scientists 35 D-Index: 372 scientists 36 D-Index: 389 scientists 37 D-Index: 366 scientists 38 D-Index: 344 scientists 39 D-Index: 349 scientists 40 D-Index: 296 scientists 41 D-Index: 289 scientists 42 D-Index: 277 scientists 43 D-Index: 279 scientists 44 D-Index: 248 scientists 45 D-Index: 257 scientists 46 D-Index: 212 scientists 47 D-Index: 202 scientists 48 D-Index: 207 scientists 49 D-Index: 204 scientists 50 D-Index: 183 scientists 51 D-Index: 178 scientists 52 D-Index: 182 scientists 53 D-Index: 178 scientists 54 D-Index: 163 scientists 55 D-Index: 117 scientists 56 D-Index: 163 scientists 57 D-Index: 120 scientists 58 D-Index: 113 scientists 59 D-Index: 136 scientists 60 D-Index: 135 scientists 61 D-Index: 96 scientists 62 D-Index: 103 scientists 63 D-Index: 83 scientists 64 D-Index: 103 scientists 65 D-Index: 83 scientists 66 D-Index: 89 scientists 67 D-Index: 92 scientists 68 D-Index: 89 scientists 69 D-Index: 78 scientists 70 D-Index: 75 scientists 71 D-Index: 53 scientists 72 D-Index: 62 scientists 73 D-Index: 54 scientists 74 D-Index: 35 scientists 75 D-Index: 52 scientists 76 D-Index: 50 scientists 77 D-Index: 32 scientists 78 D-Index: 37 scientists 79 D-Index: 20 scientists 80 D-Index: 33 scientists 81 D-Index: 36 scientists 82 D-Index: 34 scientists 83 D-Index: 34 scientists 84 D-Index: 24 scientists 85 D-Index: 19 scientists 86 D-Index: 18 scientists 87 D-Index: 26 scientists 88 D-Index: 30 scientists 89 D-Index: 17 scientists 90 D-Index: 21 scientists 91 D-Index: 19 scientists 92 D-Index: 15 scientists 93 D-Index: 14 scientists 94 D-Index: 20 scientists 95 D-Index: 9 scientists 96 D-Index: 10 scientists 97 D-Index: 15 scientists 98 D-Index: 13 scientists 99 D-Index: 3 scientists 100 D-Index: 13 scientists 101 D-Index: 3 scientists 102 D-Index: 9 scientists 103 D-Index: 4 scientists 104 D-Index: 6 scientists 105 D-Index: 6 scientists 106+ D-Index: 98 scientists
30 D-Index 106+

This scientist: 47 D-Index — 57th percentile

57% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 106 D-Index or more.

View D-Index distribution as a table
Number of Earth Science scientists by D-index, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
D-Index Scientists This scientist
30 144
31 215
32 278
33 379
34 366
35 372
36 389
37 366
38 344
39 349
40 296
41 289
42 277
43 279
44 248
45 257
46 212
47 202 47
48 207
49 204
50 183
51 178
52 182
53 178
54 163
55 117
56 163
57 120
58 113
59 136
60 135
61 96
62 103
63 83
64 103
65 83
66 89
67 92
68 89
69 78
70 75
71 53
72 62
73 54
74 35
75 52
76 50
77 32
78 37
79 20
80 33
81 36
82 34
83 34
84 24
85 19
86 18
87 26
88 30
89 17
90 21
91 19
92 15
93 14
94 20
95 9
96 10
97 15
98 13
99 3
100 13
101 3
102 9
103 4
104 6
105 6
106+ 98
Download as CSV

Kirk R. Johnson D-index placement in Earth Science in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 9,176 Earth Science scientists ranked by Research.com in 2026, grouped into 77 ranges running from 30 to 106+ D-Index.
  • Kirk R. Johnson, a Earth Science scholar from National Museum of Natural History, records 47 D-Index - the 57th percentile of the discipline.
  • 57% of ranked Earth Science scientists score the same or lower than Kirk R. Johnson, and about 43% score higher.
  • The median of the discipline falls in the 44 D-Index range, and Kirk R. Johnson ranks above the median.
  • The most crowded range is 36 D-Index, holding 389 scientists (4% of the field).
  • 62% of the field sits in the lowest quarter of the value range (up to 49 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 106 D-Index or more, 98 scientists in all (1% of the field).

Research.com Recognitions

  • 2011 - Fellow of John Simon Guggenheim Memorial Foundation

Overview

Kirk R. Johnson is affiliated with the National Museum of Natural History in the United States. Their research spans multiple fields, primarily Agricultural and Biological Sciences with contributions to Earth and Planetary Sciences.

The main areas of study include:

  • Agricultural and Biological Sciences
  • Earth and Planetary Sciences

Within these broader fields, the subfields of study involve:

  • Ecology, Evolution, Behavior and Systematics
  • Paleontology
  • Geophysics
  • Molecular Biology
  • Plant Science

Their research topics mainly focus on:

  • Plant Diversity and Evolution
  • Plant and animal studies
  • Fern and Epiphyte Biology
  • Plant and Fungal Species Descriptions
  • Evolution and Paleontology Studies
  • Botany and Geology in Latin America and Caribbean
  • Geological and Tectonic Studies in Latin America

Kirk R. Johnson has authored several papers published in reputable scientific journals. Recent papers include:

  • "An image dataset of cleared, x-rayed, and fossil leaves vetted to plant family for human and machine learning" (2021) in PhytoKeys
  • "Nitrogen isotopes reveal independent origins of N2-fixing symbiosis in extant cycad lineages" (2023) in Nature Ecology & Evolution
  • "Insect herbivory on Catula gettyi gen. et sp. nov. (Lauraceae) from the Kaiparowits Formation (Late Cretaceous, Utah, USA)" (2022) in PLoS ONE
  • "No Consistent Shift in Leaf Dry Mass per Area Across the Cretaceous-Paleogene Boundary" (2022) in Frontiers in Plant Science
  • "Correction: Insect herbivory on Catula gettyi gen. et sp. nov. (Lauraceae) from the Kaiparowits Formation (Late Cretaceous, Utah, USA)" (2022) in PLoS ONE

Their frequent coauthors have included:

  • Ian M. Miller
  • Peter Wilf
  • Scott L. Wing
  • Herbert W. Meyer
  • Rohit Saha

Frequent publication venues for their work are:

  • PLoS ONE
  • PhytoKeys
  • Nature Ecology & Evolution
  • Frontiers in Plant Science
  • Journal of Paleontology

Kirk R. Johnson was awarded a fellowship by the John Simon Guggenheim Memorial Foundation in 2011.

Best Publications

  • The Chicxulub Asteroid Impact and Mass Extinction at the Cretaceous-Paleogene Boundary

    Peter Schulte;Laia Alegret;Ignacio Arenillas;José A. Arz

  • Sensitivity of leaf size and shape to climate: Global patterns and paleoclimatic applications

    Daniel J. Peppe;Daniel J. Peppe;Dana L. Royer;Bárbara Cariglino;Sofia Y. Oliver

  • Impact of the terminal Cretaceous event on plant–insect associations

    Conrad C. Labandeira;Conrad C. Labandeira;Kirk R. Johnson;Peter Wilf

  • High Plant Diversity in Eocene South America: Evidence from Patagonia

    Peter Wilf;Peter Wilf;Peter Wilf;N. Rubén Cúneo;Kirk R. Johnson;Jason F. Hicks

  • Correlated terrestrial and marine evidence for global climate changes before mass extinction at the Cretaceous-Paleogene boundary.

    Peter Wilf;Kirk R. Johnson;Brian T. Huber

  • Eocene Plant Diversity at Laguna del Hunco and Río Pichileufú, Patagonia, Argentina

    Peter Wilf;Kirk R. Johnson;N. Rubén Cúneo;M. Elliot Smith

  • Exceptional continental record of biotic recovery after the Cretaceous–Paleogene mass extinction

    T. R. Lyson;I. M. Miller;A. D. Bercovici;A. D. Bercovici;K. Weissenburger

  • Timing the radiations of leaf beetles: hispines on gingers from latest cretaceous to recent.

    Peter Wilf;Conrad C. Labandeira;W. John Kress;Charles L. Staines

  • Decoupled Plant and Insect Diversity After the End-Cretaceous Extinction

    Peter Wilf;Conrad C. Labandeira;Conrad C. Labandeira;Kirk R. Johnson;Beth Ellis

  • Land plant extinction at the end of the Cretaceous: a quantitative analysis of the North Dakota megafloral record

    Peter Daniel Wilf;Kirk R. Johnson

  • The Hell Creek Formation and the Cretaceous-Tertiary boundary in the Northern Great Plains: an integrated continental record of the end of the Cretaceous

    Joseph Herbert Hartman;Kirk R. Johnson;Douglas J. Nichols

  • Fossil leaf economics quantified: calibration, Eocene case study, and implications

    Dana L. Royer;Lawren Sack;Peter Wilf;Christopher H. Lusk

  • A Tropical Rainforest in Colorado 1.4 Million Years After the Cretaceous-Tertiary Boundary

    Kirk R. Johnson;Beth Ellis

  • Habitat-related error in estimating temperatures from leaf margins in a humid tropical forest.

    Robyn J. Burnham;Nigel C. A. Pitman;Kirk R. Johnson;Peter Wilf

  • A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs

    Ari Iglesias;Peter Wilf;Kirk R. Johnson;Alba B. Zamuner

  • Oldest known Eucalyptus macrofossils are from South America.

    María A. Gandolfo;Elizabeth J. Hermsen;María C. Zamaloa;Kevin C. Nixon

  • Megaflora of the Hell Creek and lower Fort Union Formations in the western Dakotas: Vegetational response to climate change, the Cretaceous-Tertiary boundary event, and rapid marine transgression

    Kirk R. Johnson

  • Plants and the K-T Boundary

    Douglas J. Nichols;Kirk R. Johnson

  • Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests.

    Peter Wilf;Stefan A. Little;Ari Iglesias;Ari Iglesias;María del Carmen Zamaloa

  • High-resolution leaf-fossil record spanning the Cretaceous/Tertiary boundary

    Kirk R. Johnson;Douglas J. Nichols;Moses Attrep;Charles J. Orth

Frequent Co-Authors

Peter Wilf
Peter Wilf Pennsylvania State University
Conrad C. Labandeira
Conrad C. Labandeira Smithsonian Institution
William C. Clyde
William C. Clyde University of New Hampshire
Maria A. Gandolfo
Maria A. Gandolfo Cornell University
Dana L. Royer
Dana L. Royer Wesleyan University
Scott L. Wing
Scott L. Wing National Museum of Natural History
Gar W. Rothwell
Gar W. Rothwell Ohio University
Ruth A. Stockey
Ruth A. Stockey Oregon State University

If you think any of the details on this page are incorrect, let us know.

Report an issue

We appreciate your kind effort to assist us to improve this page, it would be helpful providing us with as much detail as possible in the text box below:

Related Online Degrees & Career Pathways

Exploring related online degrees can open diverse career pathways for those interested in Earth Science. For instance, a creative blend of technology and art can be found in an online degree in photography, which complements skills in environmental documentation and research.

Veterans seeking new opportunities may find specialized programs beneficial. There are tailored options such as online photography degree programs for veterans, designed to leverage military experience while expanding technical expertise in visual sciences.

Language proficiency is another valuable asset within Earth Science careers, especially for global collaboration. Affordable and efficient study options like the spanish online degree provide practical skills that enhance communication and research outreach.

Military veterans can also access focused language programs suited to their backgrounds, such as the online spanish degree for military veterans, which delivers tailored support and flexible learning environments.

By pursuing these related online degrees, students and professionals can expand their expertise and improve career prospects in fields connected to Earth Science.

Best Scientists Citing Kirk R. Johnson

Trending Scientists

Recently Published Articles