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Katherine H. Freeman 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 Katherine H. Freeman sits on this spectrum.

38–42 publications: 1 scientists 43–47 publications: 0 scientists 48–52 publications: 3 scientists 53–57 publications: 8 scientists 58–62 publications: 11 scientists 63–67 publications: 16 scientists 68–72 publications: 24 scientists 73–77 publications: 31 scientists 78–82 publications: 49 scientists 83–87 publications: 77 scientists 88–92 publications: 86 scientists 93–97 publications: 88 scientists 98–102 publications: 92 scientists 103–107 publications: 84 scientists 108–112 publications: 102 scientists 113–117 publications: 108 scientists 118–122 publications: 117 scientists 123–127 publications: 126 scientists 128–132 publications: 146 scientists 133–137 publications: 114 scientists 138–142 publications: 102 scientists 143–147 publications: 127 scientists 148–152 publications: 102 scientists 153–157 publications: 112 scientists 158–162 publications: 102 scientists 163–167 publications: 127 scientists 168–172 publications: 121 scientists 173–177 publications: 112 scientists 178–182 publications: 109 scientists 183–187 publications: 98 scientists 188–192 publications: 92 scientists 193–197 publications: 105 scientists 198–202 publications: 77 scientists 203–207 publications: 80 scientists 208–212 publications: 89 scientists 213–217 publications: 70 scientists 218–222 publications: 74 scientists 223–227 publications: 74 scientists 228–232 publications: 70 scientists 233–237 publications: 67 scientists 238–242 publications: 59 scientists 243–247 publications: 67 scientists 248–252 publications: 51 scientists 253–257 publications: 46 scientists 258–262 publications: 41 scientists 263–267 publications: 39 scientists 268–272 publications: 34 scientists 273–277 publications: 39 scientists 278–282 publications: 35 scientists 283–287 publications: 36 scientists 288–292 publications: 35 scientists 293–297 publications: 29 scientists 298–302 publications: 23 scientists 303–307 publications: 39 scientists 308–312 publications: 34 scientists 313–317 publications: 23 scientists 318–322 publications: 18 scientists 323–327 publications: 18 scientists 328–332 publications: 21 scientists 333–337 publications: 20 scientists 338–342 publications: 15 scientists 343–347 publications: 13 scientists 348–352 publications: 24 scientists 353–357 publications: 25 scientists 358–362 publications: 10 scientists 363–367 publications: 20 scientists 368–372 publications: 17 scientists 373–377 publications: 18 scientists 378–382 publications: 15 scientists 383–387 publications: 7 scientists 388–392 publications: 22 scientists 393–397 publications: 9 scientists 398–402 publications: 11 scientists 403–407 publications: 16 scientists 408–412 publications: 4 scientists 413–417 publications: 5 scientists 418–422 publications: 14 scientists 423–427 publications: 8 scientists 428–432 publications: 7 scientists 433–437 publications: 7 scientists 438–442 publications: 10 scientists 443–447 publications: 10 scientists 448–452 publications: 3 scientists 453–457 publications: 9 scientists 458–462 publications: 11 scientists 463–467 publications: 4 scientists 468–472 publications: 6 scientists 473–477 publications: 11 scientists 478–482 publications: 8 scientists 483–487 publications: 2 scientists 488–492 publications: 3 scientists 493–497 publications: 4 scientists 498–502 publications: 4 scientists 503–507 publications: 4 scientists 508–509 publications: 4 scientists 510+ publications: 100 scientists
38 publications 510+

The last bar groups every scientist with 510 publications or more.

Katherine H. Freeman 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 Katherine H. Freeman sits on this spectrum.

30 D-Index: 15 scientists 31 D-Index: 42 scientists 32 D-Index: 60 scientists 33 D-Index: 90 scientists 34 D-Index: 103 scientists 35 D-Index: 108 scientists 36 D-Index: 142 scientists 37 D-Index: 147 scientists 38 D-Index: 147 scientists 39 D-Index: 152 scientists 40 D-Index: 143 scientists 41 D-Index: 157 scientists 42 D-Index: 141 scientists 43 D-Index: 151 scientists 44 D-Index: 140 scientists 45 D-Index: 135 scientists 46 D-Index: 121 scientists 47 D-Index: 108 scientists 48 D-Index: 128 scientists 49 D-Index: 111 scientists 50 D-Index: 106 scientists 51 D-Index: 112 scientists 52 D-Index: 102 scientists 53 D-Index: 103 scientists 54 D-Index: 94 scientists 55 D-Index: 61 scientists 56 D-Index: 101 scientists 57 D-Index: 71 scientists 58 D-Index: 65 scientists 59 D-Index: 78 scientists 60 D-Index: 93 scientists 61 D-Index: 56 scientists 62 D-Index: 58 scientists 63 D-Index: 52 scientists 64 D-Index: 63 scientists 65 D-Index: 49 scientists 66 D-Index: 53 scientists 67 D-Index: 57 scientists 68 D-Index: 50 scientists 69 D-Index: 44 scientists 70 D-Index: 44 scientists 71 D-Index: 31 scientists 72 D-Index: 33 scientists 73 D-Index: 33 scientists 74 D-Index: 23 scientists 75 D-Index: 32 scientists 76 D-Index: 24 scientists 77 D-Index: 17 scientists 78 D-Index: 19 scientists 79 D-Index: 9 scientists 80 D-Index: 21 scientists 81 D-Index: 20 scientists 82 D-Index: 17 scientists 83 D-Index: 19 scientists 84 D-Index: 19 scientists 85 D-Index: 14 scientists 86 D-Index: 6 scientists 87 D-Index: 14 scientists 88 D-Index: 17 scientists 89 D-Index: 10 scientists 90 D-Index: 8 scientists 91 D-Index: 8 scientists 92 D-Index: 9 scientists 93 D-Index: 6 scientists 94+ D-Index: 98 scientists
30 D-Index 94+

The last bar groups every scientist with 94 D-Index or more.

Research.com Recognitions

  • 2013 - Fellow of American Geophysical Union (AGU)
  • 2013 - Member of the National Academy of Sciences
  • 2010 - Fellow of John Simon Guggenheim Memorial Foundation
  • Fellow of the Geological Society of America
  • Fellow of the Geological Society of America
  • Fellow of the Geological Society of America

Overview

Katherine H. Freeman is affiliated with Pennsylvania State University in the United States. Their research spans a range of topics within Earth and Planetary Sciences and Environmental Science, with a focus on both broad and specialized areas.

The primary fields of study include:

  • Earth and Planetary Sciences
  • Environmental Science

More specific subfields investigated by Freeman encompass:

  • Atmospheric Science
  • Ecology
  • Astronomy and Astrophysics
  • Paleontology
  • Environmental Chemistry

Their work covers several main topics, including:

  • Geology and Paleoclimatology Research
  • Isotope Analysis in Ecology
  • Hydrocarbon exploration and reservoir analysis
  • Methane Hydrates and Related Phenomena
  • Astro and Planetary Science
  • Mass Spectrometry Techniques and Applications
  • Paleontology and Stratigraphy of Fossils

Freeman has published extensively, contributing to notable scientific venues. Frequent publication outlets feature:

  • Abstracts with programs - Geological Society of America
  • Annual Review of Earth and Planetary Sciences
  • Paleoceanography and Paleoclimatology
  • Palaeogeography Palaeoclimatology Palaeoecology
  • Geochimica et Cosmochimica Acta

Among recent published papers are:

  • "Fire distinguishers: Refined interpretations of polycyclic aromatic hydrocarbons for paleo-applications" (2020, Geochimica et Cosmochimica Acta)
  • "Organic matter from the Chicxulub crater exacerbated the K-Pg impact winter" (2020, Proceedings of the National Academy of Sciences)
  • "Abundant ammonia and nitrogen-rich soluble organic matter in samples from asteroid (101955) Bennu" (2025, Nature Astronomy)
  • "Microbial life in the nascent Chicxulub crater" (2020, Geology)
  • "Origin of a global carbonate layer deposited in the aftermath of the Cretaceous-Paleogene boundary impact" (2020, Earth and Planetary Science Letters)

Freeman has collaborated frequently with several researchers, including:

  • Allison A. Baczynski
  • Allison T. Karp
  • Kliti Grice
  • Raymond Jeanloz
  • Shelby Lyons

The scientist has received recognition in the form of several awards and honors:

  • Member of the National Academy of Sciences (2013)
  • Fellow of American Geophysical Union (AGU) (2013)
  • Fellow of John Simon Guggenheim Memorial Foundation (2010)
  • Fellow of the Geological Society of America

Best Publications

  • Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene

    Mark Pagani;James C. Zachos;James C. Zachos;James C. Zachos;Katherine H. Freeman;Katherine H. Freeman;Katherine H. Freeman;Brett Tipple;Brett Tipple;Brett Tipple

  • Molecular Paleohydrology: Interpreting the Hydrogen-Isotopic Composition of Lipid Biomarkers from Photosynthesizing Organisms

    Dirk Sachse;Isabelle Billault;Gabriel J. Bowen;Yoshito Chikaraishi

  • Compound-specific isotopic analyses: a novel tool for reconstruction of ancient biogeochemical processes.

    J.M. Hayes;Katherine H. Freeman;Brian N. Popp;Christopher H. Hoham

  • Global patterns in leaf 13C discrimination and implications for studies of past and future climate

    Aaron F. Diefendorf;Kevin E. Mueller;Scott. L. Wing;Paul L. Koch

  • Fractionation of carbon isotopes by phytoplankton and estimates of ancient CO2 levels

    Katherine Haines Freeman;J. M. Hayes

  • Evidence from carbon isotope measurements for diverse origins of sedimentary hydrocarbons.

    Katherine H. Freeman;J. M. Hayes;Jean Michel Trendel;Pierre Albrecht

  • Transient Floral Change and Rapid Global Warming at the Paleocene-Eocene Boundary

    Scott L. Wing;Guy J. Harrington;Francesca A. Smith;Francesca A. Smith;Jonathan I. Bloch

  • Late Miocene Atmospheric CO2 Concentrations and the Expansion of C4 Grasses

    Mark Pagani;Katherine H. Freeman;Michael A. Arthur

  • Miocene evolution of atmospheric carbon dioxide

    Mark Pagani;Mark Pagani;Michael A. Arthur;Katherine H. Freeman

  • Consistent fractionation of 13C in nature and in the laboratory: growth-rate effects in some haptophyte algae.

    Robert R. Bidigare;Arnim Fluegge;Arnim Fluegge;Katherine H. Freeman;Kristi L. Hanson

  • Climate change as the dominant control on glacial-interglacial variations in C3 and C4 plant abundance

    Y. Huang;F. A. Street-Perrott;S. E. Metcalfe;M. Brenner

  • New insights into Archean sulfur cycle from mass-independent sulfur isotope records from the Hamersley Basin, Australia

    Shuhei Ono;Jennifer L. Eigenbrode;Alexander A. Pavlov;Pushker Kharecha

  • Influence of physiology and climate on δD of leaf wax n-alkanes from C3 and C4 grasses

    Francesca A. Smith;Katherine H. Freeman

  • Production of n-alkyl lipids in living plants and implications for the geologic past

    Aaron F. Diefendorf;Katherine H. Freeman;Scott L. Wing;Heather V. Graham

  • Slow release of fossil carbon during the Palaeocene-Eocene Thermal Maximum

    Ying Cui;Lee R. Kump;Andy J. Ridgwell;Adam J. Charles

  • Paleoaltimetry of the Tibetan Plateau from D/H ratios of lipid biomarkers

    Pratigya J. Polissar;Katherine H. Freeman;David B. Rowley;Francesca A. McInerney

  • Late Archean rise of aerobic microbial ecosystems

    Jennifer L. Eigenbrode;Katherine H. Freeman

  • Molecular and isotopic records of C4 grassland expansion in the late miocene

    K.H. Freeman;L.A. Colarusso

  • Water column anoxia, enhanced productivity and concomitant changes in δ13C and δ34S across the Frasnian–Famennian boundary (Kowala — Holy Cross Mountains/Poland)

    Michael M Joachimski;Christian Ostertag-Henning;Richard D Pancost;Harald Strauss

  • Carbon isotope geochemistry of the Frasnian–Famennian transition

    MM Joachimski;Rich D Pancost;KH Freeman;C Ostertag-Henning

  • Magnitude of the carbon isotope excursion at the Paleocene-Eocene thermal maximum: The role of plant community change

    Francesca A. Smith;Francesca A. Smith;Scott L. Wing;Katherine H. Freeman

  • SUPPLEMENTARY MATERIAL FOR "Molecular paleohydrology: interpreting the hydrogen-isotopic composition of lipid biomarkers from photosynthesizing organisms"

    Dirk Sachse;Isabelle Billault;Gabriel J. Bowen;Yoshito Chikaraishi

Frequent Co-Authors

Ian G. Stanistreet
Ian G. Stanistreet University of Liverpool
Richard D. Pancost
Richard D. Pancost University of Bristol
Michael A. Arthur
Michael A. Arthur Pennsylvania State University
Lee R. Kump
Lee R. Kump Pennsylvania State University
Kliti Grice
Kliti Grice Curtin University
Stuart G. Wakeham
Stuart G. Wakeham Skidaway Institute of Oceanography
Timothy J. Bralower
Timothy J. Bralower Pennsylvania State University
Scott L. Wing
Scott L. Wing National Museum of Natural History
Simon C. Brassell
Simon C. Brassell Indiana University

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