World's Best Scientists 2026 revealed!

D-Index & Metrics

Psychology

D-Index
38
Citations
6003
World Ranking
8886
National Ranking
3

Jack E. James publications per year

1974: 1 publications 1975: 0 publications 1976: 1 publications 1977: 0 publications 1978: 0 publications 1979: 2 publications 1980: 1 publications 1981: 4 publications 1982: 3 publications 1983: 4 publications 1984: 0 publications 1985: 3 publications 1986: 1 publications 1987: 4 publications 1988: 2 publications 1989: 4 publications 1990: 2 publications 1991: 2 publications 1992: 0 publications 1993: 2 publications 1994: 8 publications 1995: 5 publications 1996: 2 publications 1997: 4 publications 1998: 2 publications 1999: 2 publications 2000: 1 publications 2001: 0 publications 2002: 4 publications 2003: 1 publications 2004: 4 publications 2005: 6 publications 2006: 3 publications 2007: 5 publications 2008: 1 publications 2009: 2 publications 2010: 3 publications 2011: 11 publications 2012: 8 publications 2013: 4 publications 2014: 5 publications 2015: 5 publications 2016: 15 publications 2017: 5 publications 2018: 5 publications 2019: 3 publications 2020: 3 publications 2021: 2 publications 2022: 4 publications 2023: 4 publications 2024: 1 publications 2025: 4 publications
1974 2025

168 publications in total across all disciplines

Jack E. James publication distribution in Psychology in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Psychology in 2026. The highlighted bar marks where Jack E. James sits on this spectrum.

31–40 publications: 6 scientists 41–50 publications: 52 scientists 51–60 publications: 138 scientists 61–70 publications: 299 scientists 71–80 publications: 461 scientists 81–90 publications: 605 scientists 91–100 publications: 713 scientists 101–110 publications: 736 scientists 111–120 publications: 686 scientists 121–130 publications: 670 scientists 131–140 publications: 644 scientists 141–150 publications: 597 scientists 151–160 publications: 576 scientists 161–170 publications: 477 scientists 171–180 publications: 450 scientists 181–190 publications: 397 scientists 191–200 publications: 343 scientists 201–210 publications: 328 scientists 211–220 publications: 313 scientists 221–230 publications: 283 scientists 231–240 publications: 226 scientists 241–250 publications: 196 scientists 251–260 publications: 201 scientists 261–270 publications: 171 scientists 271–280 publications: 151 scientists 281–290 publications: 139 scientists 291–300 publications: 113 scientists 301–310 publications: 102 scientists 311–320 publications: 100 scientists 321–330 publications: 76 scientists 331–340 publications: 92 scientists 341–350 publications: 85 scientists 351–360 publications: 69 scientists 361–370 publications: 71 scientists 371–380 publications: 63 scientists 381–390 publications: 58 scientists 391–400 publications: 57 scientists 401–410 publications: 43 scientists 411–420 publications: 33 scientists 421–430 publications: 50 scientists 431–440 publications: 41 scientists 441–450 publications: 32 scientists 451–460 publications: 27 scientists 461–470 publications: 28 scientists 471–480 publications: 25 scientists 481–490 publications: 28 scientists 491–500 publications: 20 scientists 501–510 publications: 23 scientists 511–520 publications: 26 scientists 521–530 publications: 17 scientists 531–540 publications: 21 scientists 541–550 publications: 14 scientists 551–560 publications: 16 scientists 561–570 publications: 10 scientists 571–580 publications: 22 scientists 581–590 publications: 9 scientists 591–600 publications: 14 scientists 601–610 publications: 9 scientists 611–620 publications: 11 scientists 621–630 publications: 4 scientists 631–640 publications: 7 scientists 641–650 publications: 5 scientists 651–660 publications: 10 scientists 661–670 publications: 8 scientists 671–680 publications: 8 scientists 681–690 publications: 4 scientists 691–700 publications: 3 scientists 701–704 publications: 4 scientists 705+ publications: 100 scientists
31 publications 705+

This scientist: 129 publications — 38th percentile

38% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 705 publications or more.

Jack E. James D-index placement in Psychology in 2026

The chart shows the D-index (discipline H-index) distribution of Psychology scientists ranked by Research.com in 2026. The highlighted bar marks where Jack E. James sits on this spectrum.

30–31 D-Index: 398 scientists 32–33 D-Index: 702 scientists 34–35 D-Index: 671 scientists 36–37 D-Index: 659 scientists 38–39 D-Index: 641 scientists 40–41 D-Index: 671 scientists 42–43 D-Index: 617 scientists 44–45 D-Index: 558 scientists 46–47 D-Index: 495 scientists 48–49 D-Index: 487 scientists 50–51 D-Index: 445 scientists 52–53 D-Index: 390 scientists 54–55 D-Index: 408 scientists 56–57 D-Index: 345 scientists 58–59 D-Index: 325 scientists 60–61 D-Index: 321 scientists 62–63 D-Index: 248 scientists 64–65 D-Index: 290 scientists 66–67 D-Index: 218 scientists 68–69 D-Index: 219 scientists 70–71 D-Index: 215 scientists 72–73 D-Index: 183 scientists 74–75 D-Index: 169 scientists 76–77 D-Index: 132 scientists 78–79 D-Index: 137 scientists 80–81 D-Index: 120 scientists 82–83 D-Index: 112 scientists 84–85 D-Index: 86 scientists 86–87 D-Index: 101 scientists 88–89 D-Index: 83 scientists 90–91 D-Index: 77 scientists 92–93 D-Index: 70 scientists 94–95 D-Index: 78 scientists 96–97 D-Index: 58 scientists 98–99 D-Index: 53 scientists 100–101 D-Index: 57 scientists 102–103 D-Index: 48 scientists 104–105 D-Index: 53 scientists 106–107 D-Index: 46 scientists 108–109 D-Index: 24 scientists 110–111 D-Index: 35 scientists 112–113 D-Index: 27 scientists 114–115 D-Index: 32 scientists 116–117 D-Index: 31 scientists 118–119 D-Index: 22 scientists 120–121 D-Index: 16 scientists 122–123 D-Index: 24 scientists 124–125 D-Index: 18 scientists 126–127 D-Index: 11 scientists 128–129 D-Index: 19 scientists 130–131 D-Index: 10 scientists 132–133 D-Index: 16 scientists 134–135 D-Index: 10 scientists 136–137 D-Index: 12 scientists 138–139 D-Index: 8 scientists 140–141 D-Index: 5 scientists 142–143 D-Index: 12 scientists 144+ D-Index: 98 scientists
30 D-Index 144+

This scientist: 38 D-Index — 24th percentile

24% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 144 D-Index or more.

Overview

Jack E. James is affiliated with Reykjavík University in Iceland and has contributed to multiple publications primarily within the field of Medicine. Their research spans various subfields including Pharmacology, Aquatic Science, Physiology, Immunology, and General Health Professions.

The scientist's work covers several main topics, notably:

  • Coffee research and impacts
  • Smoking Behavior and Cessation
  • Aquaculture disease management and microbiota
  • Aquaculture Nutrition and Growth
  • Aquatic life and conservation
  • Academic Publishing and Open Access
  • Obesity, Physical Activity, Diet

Jack E. James has coauthored papers frequently with several researchers, including:

  • Álfgeir L. Kristjánsson
  • Steven M. Kogan
  • Christa Lilly
  • Megan L. Smith
  • Michael J. Mann

The scientist has published in a variety of venues, such as:

  • BMJ evidence-based medicine
  • Aquaculture Reports
  • JMIR Research Protocols
  • Journal of the Association for Information Science and Technology
  • Preventive Medicine

Among the notable papers authored or coauthored by Jack E. James are:

  • Maternal caffeine consumption and pregnancy outcomes: a narrative review with implications for advice to mothers and mothers-to-be, 2020, BMJ evidence-based medicine
  • Pirate open access as electronic civil disobedience: Is it ethical to breach the paywalls of monetized academic publishing?, 2020, Journal of the Association for Information Science and Technology

Best Publications

  • Caffeine and health

    Jack E James

  • Critical review of dietary caffeine and blood pressure: a relationship that should be taken more seriously.

    Jack E. James

  • Experiential learning and change: Theory design and practice

    G. A. Walter;S. E. Marks;Jack E. James

  • A Meta-analysis of the effects of experimental manipulations of social support during laboratory stress

    Einar B Thorsteinsson;Jack E James

  • Effects of caffeine on performance and mood: withdrawal reversal is the most plausible explanation.

    Jack E. James;Peter J. Rogers

  • Stress among Parents of Children with and without Autism Spectrum Disorder: A Comparison Involving Physiological Indicators and Parent Self-Reports

    Ciara Padden;Jack E. James

  • Understanding Caffeine: A Biobehavioral Analysis

    Jack E. James

  • Acute and chronic effects of caffeine on performance, mood, headache, and sleep.

    Jack E. James

  • Adolescent substance use, parental monitoring, and leisure-time activities: 12-year outcomes of primary prevention in Iceland

    Alfgeir Logi Kristjansson;Alfgeir Logi Kristjansson;Jack E. James;John P. Allegrante;Inga Dora Sigfusdottir

  • Adolescent Substance Use, Sleep, and Academic Achievement: Evidence of Harm Due to Caffeine.

    Jack E. James;Álfgeir Logi Kristjánsson;Inga Dóra Sigfúsdóttir

  • Hemodynamic profile of stress-induced anticipation and recovery

    M.Elizabeth Gregg;Jack E. James;Thomas A. Matyas;Einar B. Thorsteinsson

  • Does Caffeine Enhance or Merely Restore Degraded Psychomotor Performance

    Jack E. James

  • Influence of attention focus and trait anxiety on tolerance of acute pain.

    Jack E. James;Drifa Hardardottir

  • Parenting Stress, Salivary Biomarkers, and Ambulatory Blood Pressure: A Comparison Between Mothers and Fathers of Children with Autism Spectrum Disorders

    Ciara Foody;Jack E. James;Jack E. James;Geraldine Leader

  • Effects of video-relayed social support on hemodynamic reactivity and salivary cortisol during laboratory-based behavioral challenge.

    Thorsteinsson Eb;James Je;Gregg Me

  • The modification of parent behavior. A review of generalization and maintenance.

    Matthew R. Sanders;Jack E. James

  • Is habitual caffeine use a preventable cardiovascular risk factor

    Jack E James

  • Individual differences in adaptation of cardiovascular responses to stress.

    Brian M. Hughes;Siobhán Howard;Jack E. James;Niamh M. Higgins

  • Self‐report reliability and symptomatology of habitual caffeine consumption.

    J E James;M S Bruce;M H Lader;N R Scott

  • Marital Discord and Child Behavior Problems: A Description of Family Interactions During Treatment

    Mark R. Dadds;Matthew R. Sanders;Brett C. Behrens;Jack E. James

Frequent Co-Authors

Alfgeir L. Kristjansson
Alfgeir L. Kristjansson West Virginia University
Inga Dora Sigfusdottir
Inga Dora Sigfusdottir Reykjavík University
Michael Keane
Michael Keane Johns Hopkins University
John P. Allegrante
John P. Allegrante Columbia University
Peter J. Rogers
Peter J. Rogers University of Bristol
Ásgeir R. Helgason
Ásgeir R. Helgason Karolinska Institute
Einar B. Thorsteinsson
Einar B. Thorsteinsson University of New England
Matthew R. Sanders
Matthew R. Sanders University of Queensland
Josep M. Mercader
Josep M. Mercader Broad Institute

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