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David O. Kennedy

D-Index & Metrics

Psychology

D-Index
63
Citations
16207
World Ranking
3107
National Ranking
333

David O. Kennedy 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 David O. Kennedy 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: 159 publications — 54th percentile

54% of scientists in this discipline score the same or lower.

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

David O. Kennedy 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 David O. Kennedy 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: 63 D-Index — 73rd percentile

73% of scientists in this discipline score the same or lower.

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

Overview

David O. Kennedy is affiliated with Northumbria University in the United Kingdom. Their research primarily falls within the field of Medicine, with a notable focus on Complementary and Alternative Medicine, Physiology, Nutrition and Dietetics, Pharmacology, and Molecular Biology.

Their work addresses several main topics including:

  • Medicinal Plants and Neuroprotection
  • Ginkgo biloba and Cashew Applications
  • Coffee Research and Impacts
  • Ginseng Biological Effects and Applications
  • Cardiovascular Health and Disease Prevention
  • Medicinal Plant Extracts Effects
  • Fatty Acid Research and Health

David O. Kennedy has co-authored numerous publications with researchers such as Philippa A. Jackson, Emma L. Wightman, Julie Khan, Joanne Forster, and Ellen Smith. These collaborations have led to multiple research outputs in well-regarded scientific venues.

Frequent publication venues include:

  • Nutrients
  • Frontiers in Nutrition
  • Nutritional Neuroscience
  • Journal of Psychopharmacology
  • Sports Medicine

Selected recent papers authored or co-authored by David O. Kennedy include:

  • "Effects of Saffron Extract Supplementation on Mood, Well-Being, and Response to a Psychosocial Stressor in Healthy Adults: A Randomized, Double-Blind, Parallel Group, Clinical Trial" (2021), published in Frontiers in Nutrition
  • "Acute Effects of a Polyphenol-Rich Leaf Extract of Mangifera indica L. (Zynamite) on Cognitive Function in Healthy Adults: A Double-Blind, Placebo-Controlled Crossover Study" (2020), published in Nutrients
  • "A Randomized, Crossover Study of the Acute Cognitive and Cerebral Blood Flow Effects of Phenolic, Nitrate and Botanical Beverages in Young, Healthy Humans" (2020), published in Nutrients
  • "Differential Effects of DHA- and EPA-Rich Oils on Sleep in Healthy Young Adults: A Randomized Controlled Trial" (2021), published in Nutrients
  • "Mental Performance and Sport: Caffeine and Co-consumed Bioactive Ingredients" (2022), published in Sports Medicine

Best Publications

  • B Vitamins and the Brain: Mechanisms, Dose and Efficacy—A Review

    David O. Kennedy

  • The effects of polyphenols and other bioactives on human health

    César G. Fraga;Kevin D. Croft;David O. Kennedy;Francisco A. Tomás-Barberán

  • Herbal extracts and phytochemicals: plant secondary metabolites and the enhancement of human brain function.

    David O. Kennedy;Emma L. Wightman

  • Effects of resveratrol on cerebral blood flow variables and cognitive performance in humans: a double-blind, placebo-controlled, crossover investigation

    David O Kennedy;Emma L Wightman;Jonathon L Reay;Georg Lietz

  • Cognitive and mood improvements of caffeine in habitual consumers and habitual non-consumers of caffeine

    Crystal F. Haskell;David O. Kennedy;Keith A. Wesnes;Andrew B. Scholey

  • Cognitive demand and blood glucose

    Andrew B Scholey;Susan Harper;David O Kennedy

  • The effects of l-theanine, caffeine and their combination on cognition and mood

    Crystal F. Haskell;David O. Kennedy;Anthea L. Milne;Keith A. Wesnes

  • Modulation of mood and cognitive performance following acute administration of Melissa officinalis (lemon balm)

    David O. Kennedy;Andrew B. Scholey;Nicola T. J. Tildesley;Elaine K. Perry

  • Glucose administration, heart rate and cognitive performance: Effects of increasing mental effort

    David O. Kennedy;Andrew B. Scholey

  • Attenuation of laboratory-induced stress in humans after acute administration of Melissa officinalis (Lemon Balm).

    David O. Kennedy;Wendy Little;Andrew B. Scholey

  • Consumption of cocoa flavanols results in acute improvements in mood and cognitive performance during sustained mental effort

    Andrew B Scholey;Stephen J French;Penelope J Morris;David O Kennedy

  • Cognitive and physiological effects of an “energy drink”: an evaluation of the whole drink and of glucose, caffeine and herbal flavouring fractions

    Andrew B. Scholey;David O. Kennedy

  • Ginseng: potential for the enhancement of cognitive performance and mood

    David O Kennedy;Andrew B Scholey

  • DHA supplementation improved both memory and reaction time in healthy young adults: a randomized controlled trial

    Welma Stonehouse;Cathryn A Conlon;John Podd;Stephen R Hill

  • The dose-dependent cognitive effects of acute administration of Ginkgo biloba to healthy young volunteers

    David O. Kennedy;Andrew B. Scholey;Keith A. Wesnes

  • Anxiolytic effects of a combination of Melissa officinalis and Valeriana officinalis during laboratory induced stress

    David O. Kennedy;Wendy Little;Crystal F Haskell;Andrew B. Scholey

  • Effects of high-dose B vitamin complex with vitamin C and minerals on subjective mood and performance in healthy males.

    David O. Kennedy;Rachel Veasey;Anthony Watson;Fiona Dodd

  • Salvia lavandulaefolia (Spanish sage) enhances memory in healthy young volunteers.

    Nicola Tildesley;David Kennedy;Elaine Perry;Clive Ballard

  • Improved cognitive performance in human volunteers following administration of guarana (Paullinia cupana) extract: comparison and interaction with Panax ginseng

    David O. Kennedy;Crystal F. Haskell;Keith Wesnes;Andrew Scholey

  • Modulation of mood and cognitive performance following acute administration of single doses of Melissa officinalis (Lemon balm) with human CNS nicotinic and muscarinic receptor-binding properties.

    David O. Kennedy;G. Wake;S. Savelev;Nicola T. J. Tildesley

  • Consumption of cocoa flavanols results in acute improvements in mood and cognitive

    Andrew B Scholey;Stephen J French;Penelope J Morris;David O Kennedy

Frequent Co-Authors

Andrew Scholey
Andrew Scholey Monash University
Keith Wesnes
Keith Wesnes University of Exeter
Elaine K. Perry
Elaine K. Perry Newcastle University
Clive Ballard
Clive Ballard University of Exeter
Andrew M. Jones
Andrew M. Jones University of Exeter
Philip C. Calder
Philip C. Calder University of Southampton
Cesar G. Fraga
Cesar G. Fraga University of California, Davis
Paul G. Winyard
Paul G. Winyard University of Exeter
Con Stough
Con Stough Swinburne University of Technology
Gary Williamson
Gary Williamson Monash University

External Links

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Related Online Degrees & Career Pathways

Studying psychology in the USA opens doors to a wide range of online degrees and diverse career pathways. Many graduates pursue specialized roles in education, mental health, and counseling. Becoming a school counselor is a popular choice, with each state maintaining its own specific requirements and licensure steps.

If you are interested in working with students in school settings, you’ll need to follow state guidelines. Explore how to become a school counselor in New Mexico for an understanding of the educational and supervised experience requirements. Alternatively, the requirements to be a school counselor in New York include specific graduate-level degrees and passing certification exams.

Other states, such as North Carolina and North Dakota, also have unique requirements. Learn more about becoming a school counselor in North Carolina or review the requirements to be a school counselor in North Dakota to compare pathways. Earning a psychology degree online provides flexibility and can help you meet these goals, as long as you meet your state’s professional standards.

Best Scientists Citing David O. Kennedy

Andrew Scholey

Andrew Scholey

Monash University

Publications: 99

Con Stough

Con Stough

Swinburne University of Technology

Publications: 56

Andrew Pipingas

Andrew Pipingas

Swinburne University of Technology

Publications: 47

Keith Wesnes

Keith Wesnes

University of Exeter

Publications: 45

Andrew Paul Smith

Andrew Paul Smith

Cardiff University

Publications: 30

Luke A. Downey

Luke A. Downey

Swinburne University of Technology

Publications: 24

Andrew C. Parrott

Andrew C. Parrott

Swansea University

Publications: 23

Peter R.C. Howe

Peter R.C. Howe

University of Newcastle Australia

Publications: 21

Jonathan M. Hodgson

Jonathan M. Hodgson

Edith Cowan University

Publications: 21

Julia J. Rucklidge

Julia J. Rucklidge

University of Canterbury

Publications: 17

Jeremy P. E. Spencer

Jeremy P. E. Spencer

University of Reading

Publications: 17

Laurie T. Butler

Laurie T. Butler

Anglia Ruskin University

Publications: 16

Kevin D. Croft

Kevin D. Croft

University of Western Australia

Publications: 16

Jonathan K. Foster

Jonathan K. Foster

Curtin University

Publications: 15

David Benton

David Benton

Swansea University

Publications: 14

Pradeep J. Nathan

Pradeep J. Nathan

University of Cambridge

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