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

Robert J. Letcher

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Environmental Sciences
Canada
2026

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Environmental Sciences 109 221 206 8 6 494 38340

Robert J. Letcher publications per year

The chart shows the history of publications by Robert J. Letcher between 1993 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Robert J. Letcher published across 34 years, from 1993 to 2026, averaging 15.3 papers a year. Output peaked at 35 publications in 2009. 14 of the 521 publications appeared in the last two years.

No. of publications
10 20 30
Bar chart. Horizontal axis: year, 1993 to 2026. Vertical axis: number of publications, 0 to 35. Peak 35 publications in 2009. 1993: 1 publication 1994: 0 publications 1995: 4 publications 1996: 1 publication 1997: 2 publications 1998: 2 publications 1999: 1 publication 2000: 7 publications 2001: 6 publications 2002: 6 publications 2003: 10 publications 2004: 9 publications 2005: 21 publications 2006: 19 publications 2007: 14 publications 2008: 25 publications 2009: 35 publications 2010: 32 publications 2011: 29 publications 2012: 25 publications 2013: 26 publications 2014: 19 publications 2015: 30 publications 2016: 22 publications 2017: 21 publications 2018: 30 publications 2019: 31 publications 2020: 13 publications 2021: 14 publications 2022: 25 publications 2023: 18 publications 2024: 9 publications 2025: 13 publications 2026: 1 publication
1993 2026

521 publications in total across all disciplines

View publications per year as a table
Robert J. Letcher: publications per year, 1993 to 2026
Year Publications
1993 1
1994 0
1995 4
1996 1
1997 2
1998 2
1999 1
2000 7
2001 6
2002 6
2003 10
2004 9
2005 21
2006 19
2007 14
2008 25
2009 35
2010 32
2011 29
2012 25
2013 26
2014 19
2015 30
2016 22
2017 21
2018 30
2019 31
2020 13
2021 14
2022 25
2023 18
2024 9
2025 13
2026 1
Total 521
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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.

No. of scientists
200 400 600
Bar chart with 66 bars. Horizontal axis: publications, 41–50 to 690+. Vertical axis: number of scientists, 0 to 617. Most scientists, 617, have 121–130 publications. The last bar groups every scientist with 690 publications or more. The highlighted bar, 491–500 publications, is where this scientist sits. 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: 282 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: 26 scientists 501–510 publications: 17 scientists 511–520 publications: 19 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 681–689 publications: 4 scientists 690+ publications: 100 scientists
41–50 publications 690+

This scientist: 494 publications — 97th percentile

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

The last bar groups every scientist with 690 publications or more.

View publications distribution as a table
Number of Environmental Sciences scientists by publication count, Research.com 2026 ranking edition. Based on 9,676 ranked scientists.
Publications Scientists This scientist
41–50 21
51–60 62
61–70 133
71–80 257
81–90 361
91–100 440
101–110 492
111–120 541
121–130 617
131–140 544
141–150 541
151–160 539
161–170 444
171–180 444
181–190 400
191–200 377
201–210 318
211–220 282
221–230 263
231–240 220
241–250 217
251–260 180
261–270 181
271–280 155
281–290 130
291–300 127
301–310 130
311–320 85
321–330 106
331–340 80
341–350 83
351–360 75
361–370 69
371–380 52
381–390 54
391–400 56
401–410 44
411–420 40
421–430 36
431–440 25
441–450 25
451–460 32
461–470 29
471–480 21
481–490 26
491–500 26 494
501–510 17
511–520 19
521–530 15
531–540 22
541–550 12
551–560 15
561–570 11
571–580 19
581–590 9
591–600 9
601–610 7
611–620 11
621–630 5
631–640 5
641–650 6
651–660 3
661–670 3
671–680 4
681–689 4
690+ 100
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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.

No. of scientists
100 200 300
Bar chart with 97 bars. Horizontal axis: D-Index, 30 to 126+. Vertical axis: number of scientists, 0 to 348. Most scientists, 348, have 45 D-Index. The last bar groups every scientist with 126 D-Index or more. The highlighted bar, 109 D-Index, is where this scientist sits. 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: 198 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: 20 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: 9 scientists 126+ D-Index: 92 scientists
30 D-Index 126+

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 126 D-Index or more.

View D-Index distribution as a table
Number of Environmental Sciences scientists by D-index, Research.com 2026 ranking edition. Based on 9,676 ranked scientists.
D-Index Scientists This scientist
30 12
31 26
32 51
33 88
34 123
35 163
36 206
37 267
38 265
39 275
40 321
41 343
42 305
43 336
44 330
45 348
46 291
47 275
48 272
49 273
50 263
51 232
52 266
53 217
54 198
55 177
56 202
57 204
58 166
59 177
60 166
61 152
62 143
63 150
64 124
65 119
66 120
67 118
68 82
69 98
70 94
71 105
72 74
73 84
74 70
75 67
76 78
77 60
78 59
79 52
80 47
81 38
82 48
83 42
84 42
85 43
86 29
87 37
88 29
89 30
90 34
91 20
92 22
93 17
94 19
95 24
96 21
97 20
98 24
99 17
100 17
101 21
102 25
103 18
104 26
105 20
106 15
107 10
108 13
109 15 109
110 12
111 8
112 7
113 9
114 6
115 12
116 7
117 8
118 3
119 5
120 7
121 2
122 4
123 8
124 7
125 9
126+ 92
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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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