World's Best Scientists 2026 revealed!
Robert J. Letcher

Robert J. Letcher

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Environmental Sciences
Canada
2026

D-Index & Metrics

Environmental Sciences

D-Index
109
Citations
38340
World Ranking
219
National Ranking
8

Robert J. Letcher publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where Robert J. Letcher sits on this spectrum.

41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 283 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 25 scientists 501–510 publications: 17 scientists 511–520 publications: 18 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–686 publications: 3 scientists 687+ publications: 100 scientists
41 publications 687+

This scientist: 494 publications — 97th percentile

97% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 687 publications or more.

Robert J. Letcher D-index placement in Environmental Sciences in 2026

The chart shows the D-index (discipline H-index) distribution of Environmental Sciences scientists ranked by Research.com in 2026. The highlighted bar marks where Robert J. Letcher sits on this spectrum.

30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 199 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 19 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125+ D-Index: 99 scientists
30 D-Index 125+

This scientist: 109 D-Index — 98th percentile

98% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 125 D-Index or more.

Research.com Recognitions

  • 2026 - Research.com Environmental Sciences in Canada Leader Award
  • 2025 - Research.com Environmental Sciences in Canada Leader Award
  • 2023 - Research.com Environmental Sciences in Canada Leader Award

Overview

Robert J. Letcher is affiliated with Carleton University in Canada and conducts research primarily in the field of Environmental Science. Their work focuses extensively on subfields such as Health, Toxicology and Mutagenesis, Ecology, Environmental Chemistry, Atmospheric Science, and Pollution.

Their research covers a range of topics, including:

  • Toxic Organic Pollutants Impact
  • Per- and polyfluoroalkyl substances research
  • Mercury impact and mitigation studies
  • Marine animal studies overview
  • Effects and risks of endocrine disrupting chemicals
  • Atmospheric chemistry and aerosols
  • Environmental Toxicology and Ecotoxicology

Robert J. Letcher has contributed to numerous scientific publications, with some of the most cited papers being:

  • "Side-chain fluorinated polymer surfactants in biosolids from wastewater treatment plants," 2020, Journal of Hazardous Materials
  • "Organophosphate (OP) diesters and a review of sources, chemical properties, environmental occurrence, adverse effects, and future directions," 2021, Environment International
  • "Functional Group-Dependent Screening of Organophosphate Esters (OPEs) and Discovery of an Abundant OPE Bis-(2-ethylhexyl)-phenyl Phosphate in Indoor Dust," 2020, Environmental Science & Technology
  • "Mercury contamination and potential health risks to Arctic seabirds and shorebirds," 2022, The Science of The Total Environment
  • "Established and emerging organophosphate esters (OPEs) and the expansion of an environmental contamination issue: A review and future directions," 2023, Journal of Hazardous Materials

The venues where Robert J. Letcher frequently publishes include:

  • Environmental Science & Technology
  • The Science of The Total Environment
  • Environmental Pollution
  • Environmental Research
  • SSRN Electronic Journal

The scientist often collaborates with colleagues including:

  • Kim J. Fernie
  • Runé Dietz
  • Chunsheng Liu
  • Christian Sonne
  • Shaogang Chu

Best Publications

  • Biological Monitoring of Polyfluoroalkyl Substances: A Review

    Magali Houde;Jonathan W. Martin;Robert J. Letcher;Keith R. Solomon

  • Monitoring of perfluorinated compounds in aquatic biota: an updated review.

    Magali Houde;Amila O. De Silva;Derek C. G. Muir;Robert J. Letcher

  • In Vitro Estrogenicity of Polybrominated Diphenyl Ethers, Hydroxylated PBDEs, and Polybrominated Bisphenol A Compounds

    I.A.T.M. Meerts;R.J. Letcher;S. Hoving;G. Marsh

  • Exposure and effects assessment of persistent organohalogen contaminants in arctic wildlife and fish.

    Robert J. Letcher;Jan Ove Bustnes;Rune Dietz;Bjørn M. Jenssen

  • Metabolism in the toxicokinetics and fate of brominated flame retardants—a review

    Heldur Hakk;Robert J. Letcher

  • Persistent organic pollutants and mercury in marine biota of the Canadian Arctic: An overview of spatial and temporal trends

    B.M. Braune;P.M. Outridge;A.T. Fisk;D.C.G. Muir

  • Debromination of the Flame Retardant Decabromodiphenyl Ether by Juvenile Carp (Cyprinus carpio) following Dietary Exposure

    Heather M. Stapleton;Mehran Alaee;Robert J. Letcher;Joel E. Baker

  • What are the toxicological effects of mercury in Arctic biota

    Rune Dietz;Christian Sonne;Niladri Basu;Birgit Braune

  • Debromination of polybrominated diphenyl ether congeners BDE 99 and BDE 183 in the intestinal tract of the common carp (Cyprinus carpio).

    Heather M. Stapleton;Robert J. Letcher;Joel E. Baker

  • Methyl Sulfone and Hydroxylated Metabolites of Polychlorinated Biphenyls

    Robert J. Letcher;Eva Klasson-Wehler;Ake Bergman

  • Predicting global killer whale population collapse from PCB pollution

    Jean-Pierre Desforges;Ailsa Hall;Bernie McConnell;Aqqalu Rosing-Asvid

  • Exposure to polybrominated diphenyl ethers (PBDEs): changes in thyroid, vitamin A, glutathione homeostasis, and oxidative stress in American kestrels (Falco sparverius).

    Kim J. Fernie;J. Laird Shutt;Greg Mayne;David Hoffman

  • Flame retardants and methoxylated and hydroxylated polybrominated diphenyl ethers in two Norwegian Arctic top predators: glaucous gulls and polar bears.

    Jonathan Verreault;Geir W. Gabrielsen;Shaogang Chu;Derek C. G. Muir

  • Effects of chloro-s-triazine herbicides and metabolites on aromatase activity in various human cell lines and on vitellogenin production in male carp hepatocytes.

    J. Thomas Sanderson;Robert J. Letcher;Marjoke Heneweer;J. P. Giesy

  • A review on organophosphate Ester (OPE) flame retardants and plasticizers in foodstuffs: Levels, distribution, human dietary exposure, and future directions.

    Jianhua Li;Luming Zhao;Robert J. Letcher;Yayun Zhang

  • Metabolism of polybrominated diphenyl ethers (PBDEs) by human hepatocytes in vitro.

    Heather M. Stapleton;Shannon M. Kelly;Ruoting Pei;Robert J. Letcher

  • Ozone treatment and the depletion of detectable pharmaceuticals and atrazine herbicide in drinking water sourced from the upper Detroit River, Ontario, Canada.

    Wenyi Hua;Erin R. Bennett;Robert J. Letcher

  • A Review of Organophosphate Esters in the Environment from Biological Effects to Distribution and Fate.

    Alana K. Greaves;Robert J. Letcher

  • Temporal Trends and Spatial Distribution of Non-polybrominated Diphenyl Ether Flame Retardants in the Eggs of Colonial Populations of Great Lakes Herring Gulls

    Lewis T. Gauthier;Dave Potter;Craig E. Hebert;Robert J. Letcher

  • Brominated flame retardants in polar bears (Ursus maritimus) from Alaska, the Canadian Arctic, East Greenland, and Svalbard.

    Derek C.G. Muir;Sean Backus;Andrew E. Derocher;Rune Dietz

  • Circumpolar study of perfluoroalkyl contaminants in polar bears (Ursus maritimus).

    Marla Smithwick;Scott A. Mabury;Keith R. Solomon;Christian Sonne

  • Current-Use Flame Retardants in the Eggs of Herring Gulls (Larus argentatus) from the Laurentian Great Lakes

    Lewis T Gauthier;Craig E Hebert;D V Chip Weseloh;Robert J Letcher

Frequent Co-Authors

Christian Sonne
Christian Sonne Aarhus University
Rune Dietz
Rune Dietz Aarhus University
Derek C. G. Muir
Derek C. G. Muir Environment and Climate Change Canada
Guanyong Su
Guanyong Su Nanjing University of Science and Technology
Frank F. Rigét
Frank F. Rigét Aarhus University
Bjørn Munro Jenssen
Bjørn Munro Jenssen Norwegian University of Science and Technology
Erik W. Born
Erik W. Born University of Alberta
Melissa A. McKinney
Melissa A. McKinney McGill University
Geir W. Gabrielsen
Geir W. Gabrielsen Norwegian Polar Institute
John P. Giesy
John P. Giesy University of Saskatchewan

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