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 37 6860 6354 2401 2125 196 5197

Paul C. Hackley publications per year

The chart shows the history of publications by Paul C. Hackley between 1998 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Paul C. Hackley published across 28 years, from 1998 to 2025, averaging 7.8 papers a year. Output peaked at 20 publications in 2020. 29 of the 217 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1998 to 2025. Vertical axis: number of publications, 0 to 20. Peak 20 publications in 2020. 1998: 1 publication 1999: 1 publication 2000: 1 publication 2001: 0 publications 2002: 0 publications 2003: 1 publication 2004: 4 publications 2005: 5 publications 2006: 5 publications 2007: 8 publications 2008: 3 publications 2009: 4 publications 2010: 6 publications 2011: 11 publications 2012: 10 publications 2013: 6 publications 2014: 8 publications 2015: 8 publications 2016: 7 publications 2017: 18 publications 2018: 13 publications 2019: 12 publications 2020: 20 publications 2021: 15 publications 2022: 12 publications 2023: 9 publications 2024: 11 publications 2025: 18 publications
1998 2025

217 publications in total across all disciplines

View publications per year as a table
Paul C. Hackley: publications per year, 1998 to 2025
Year Publications
1998 1
1999 1
2000 1
2001 0
2002 0
2003 1
2004 4
2005 5
2006 5
2007 8
2008 3
2009 4
2010 6
2011 11
2012 10
2013 6
2014 8
2015 8
2016 7
2017 18
2018 13
2019 12
2020 20
2021 15
2022 12
2023 9
2024 11
2025 18
Total 217
Download as CSV

Paul C. Hackley 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 Paul C. Hackley 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, 188–197 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: 196 publications — 61st percentile

61% 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
138–147 491
148–157 495
158–167 458
168–177 490
178–187 414
188–197 401 196
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

Paul C. Hackley 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 Paul C. Hackley 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, 37 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: 37 D-Index — 27th percentile

27% 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 37
38 344
39 349
40 296
41 289
42 277
43 279
44 248
45 257
46 212
47 202
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

Overview

Paul C. Hackley is affiliated with the United States Geological Survey in the United States. Their research primarily focuses on engineering, with significant contributions in various subfields such as mechanics of materials, analytical chemistry, global and planetary change, ocean engineering, and mechanical engineering.

Their work extensively addresses topics including hydrocarbon exploration and reservoir analysis, petroleum processing and analysis, atmospheric and environmental gas dynamics, enhanced oil recovery techniques, geochemistry and geologic mapping, coal properties and utilization, and hydraulic fracturing and reservoir analysis.

Frequent coauthors collaborating with Paul C. Hackley include Aaron M. Jubb, Brett J. Valentine, Javin J. Hatcherian, Justin E. Birdwell, and Ryan J. McAleer.

Publications by Paul C. Hackley appear predominantly in venues such as the International Journal of Coal Geology, Abstracts with programs - Geological Society of America, AAPG Bulletin, SSRN Electronic Journal, and Organic Geochemistry.

Recent papers authored or coauthored by the scientist include:

  • "A review of spatially resolved techniques and applications of organic petrography in shale petroleum systems", 2021, International Journal of Coal Geology
  • "Evidence of Cosmic Impact at Abu Hureyra, Syria at the Younger Dryas Onset (~12.8 ka): High-temperature melting at >2200 °C", 2020, Scientific Reports
  • "Relating Tmax and hydrogen index to vitrinite and solid bitumen reflectance in hydrous pyrolysis residues: Comparisons to natural thermal indices", 2021, International Journal of Coal Geology
  • "Evidence of wildfires and elevated atmospheric oxygen at the Frasnian-Famennian boundary in New York (USA): Implications for the Late Devonian mass extinction", 2020, Geological Society of America Bulletin
  • "Nanoscale Molecular Composition of Solid Bitumen from the Eagle Ford Group across a Natural Thermal Maturity Gradient", 2020, Energy & Fuels

Best Publications

  • Application of organic petrography in North American shale petroleum systems: A review

    Paul C. Hackley;Brian J. Cardott

  • The nature of porosity in organic-rich mudstones of the Upper Jurassic Kimmeridge Clay Formation, North Sea, offshore United Kingdom

    Neil S. Fishman;Paul C. Hackley;Heather A. Lowers;Ronald J. Hill

  • Review and update of the applications of organic petrology: Part 1, geological applications

    Isabel Suárez-Ruiz;Deolinda Flores;João Graciano Mendonça Filho;Paul C. Hackley

  • Pore-types and pore-network evolution in Upper Devonian-Lower Mississippian Woodford and Mississippian Barnett mudstones: Insights from laboratory thermal maturation and organic petrology

    Lucy T. Ko;Stephen C. Ruppel;Robert G. Loucks;Paul C. Hackley

  • Nanoscale geochemical and geomechanical characterization of organic matter in shale.

    Jing Yang;Javin Hatcherian;Paul C. Hackley;Andrew E. Pomerantz

  • Standardization of reflectance measurements in dispersed organic matter: Results of an exercise to improve interlaboratory agreement

    Paul C. Hackley;Carla Viviane Araujo;Angeles G. Borrego;Antonis Bouzinos

  • Understanding and distinguishing reflectance measurements of solid bitumen and vitrinite using hydrous pyrolysis: Implications to petroleum assessment

    Paul C. Hackley;Michael Lewan

  • Organic petrology and geochemistry of mudrocks from the lacustrine Lucaogou Formation, Santanghu Basin, northwest China: Application to lake basin evolution

    Paul C. Hackley;Neil Fishman;Tao Wu;Gregory Baugher

  • Biogenic origin of coalbed gas in the northern Gulf of Mexico Coastal Plain, U.S.A

    Peter D. Warwick;F. Clayton Breland;Paul C. Hackley

  • On the petrographic distinction of bituminite from solid bitumen in immature to early mature source rocks

    Paul C. Hackley;Brett J. Valentine;Javin J. Hatcherian

  • Organic petrology and micro-spectroscopy of Tasmanites microfossils: Applications to kerogen transformations in the early oil window

    Paul C. Hackley;Paul C. Hackley;Clifford C. Walters;Simon R. Kelemen;Maria Mastalerz

  • Geological and geochemical characterization of the Lower Cretaceous Pearsall Formation, Maverick Basin, south Texas: A future shale gas resource?

    Paul C. Hackley

  • Thermal maturity of northern Appalachian Basin Devonian shales: Insights from sterane and terpane biomarkers

    Paul C. Hackley;Robert T. Ryder;Michael H. Trippi;Hossein Alimi

  • Geologic shaded relief map of Venezuela

    Paul C. Hackley;Franco Urbani;Alex W. Karlsen;Christopher P. Garrity

  • Suppression of vitrinite reflectance by bitumen generated from liptinite during hydrous pyrolysis of artificial source rock

    Kenneth E. Peters;Paul C. Hackley;J. J. Thomas;A. E. Pomerantz

  • Application of Raman Spectroscopy as Thermal Maturity Probe in Shale Petroleum Systems: Insights from Natural and Artificial Maturation Series

    Paul C. Hackley;N. Keno Lünsdorf

  • High microscale variability in Raman thermal maturity estimates from shale organic matter

    Aaron M. Jubb;Palma J. Botterell;Justin E. Birdwell;Robert C. Burruss

  • Organic petrography of Leonardian (Wolfcamp A) mudrocks and carbonates, Midland Basin, Texas: The fate of oil-prone sedimentary organic matter in the oil window

    Paul C. Hackley;Tongwei Zhang;Aaron M. Jubb;Brett J. Valentine

  • A review of spatially resolved techniques and applications of organic petrography in shale petroleum systems

    Paul C. Hackley;Aaron M. Jubb;Ryan J. McAleer;Brett J. Valentine

  • Identification of alginite and bituminite in rocks other than coal. 2006, 2009, and 2011 round robin exercises of the ICCP Identification of Dispersed Organic Matter Working Group

    J. Kus;C.V. Araujo;A.G. Borrego;D. Flores

  • Assessment of Thermal Maturity Trends in Devonian–Mississippian Source Rocks Using Raman Spectroscopy: Limitations of Peak-Fitting Method

    Jason S. Lupoi;Luke P. Fritz;Thomas M. Parris;Paul C. Hackley

  • Vitrinite reflectance versus pyrolysis Tmax data: Assessing thermal maturity in shale plays with special reference to the Duvernay shale play of the Western Canadian Sedimentary Basin, Alberta, Canada

    Raphael A.J. Wust;Brent R. Nassichuk;Ron Brezovski;Paul C Hackley

Frequent Co-Authors

Maria Mastalerz
Maria Mastalerz Indiana University
Isabel Suárez-Ruiz
Isabel Suárez-Ruiz Spanish National Research Council
Deolinda Flores
Deolinda Flores University of Porto
Tongwei Zhang
Tongwei Zhang The University of Texas at Austin
Cortland F. Eble
Cortland F. Eble University of Kentucky
Mehdi Ostadhassan
Mehdi Ostadhassan Kiel University
James C. Hower
James C. Hower University of Kentucky
Thomas Gentzis
Thomas Gentzis Core Laboratories (United States)
Gunther Kletetschka
Gunther Kletetschka Charles University
James C. Weaver
James C. Weaver Cornell 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

Studying Earth Science in the USA opens diverse career opportunities that often intersect with other fields. For those interested in broadening their skill set, exploring degrees like the best online human resource management masters degree can be valuable. This degree complements scientific expertise with leadership and organizational skills, useful in managing environmental projects and teams.

Older learners considering a career change or enhancement may find flexible options among the degrees for seniors. These programs provide accessible learning tailored for mature students, enabling them to leverage their experience in new Earth Science-related roles or emerging sectors.

Another adjacent field worth exploring is Library and Information Science, especially for those passionate about data management and research. Accredited programs like the online mlis programs accredited ala offer professional training to curate scientific information effectively.

Understanding what is library science entails can also enhance an Earth Scientist's ability to organize and disseminate critical data. This skill is increasingly important as geospatial and environmental data grow in volume and complexity.

Best Scientists Citing Paul C. Hackley

Trending Scientists

Recently Published Articles