World's Best Scientists 2026 revealed!

D-Index & Metrics

Psychology

D-Index
47
Citations
10080
World Ranking
6123
National Ranking
623

Tom P. Freeman 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 Tom P. Freeman 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: 198 publications — 68th percentile

68% of scientists in this discipline score the same or lower.

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

Tom P. Freeman 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 Tom P. Freeman 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: 47 D-Index — 47th percentile

47% of scientists in this discipline score the same or lower.

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

Overview

Tom P. Freeman is affiliated with the University of Bath in the United Kingdom. Their research primarily focuses on the field of Medicine, with specific emphasis on Pharmacology, Psychiatry and Mental Health, Epidemiology, Toxicology, and Pediatrics, Perinatology and Child Health.

Their work covers various topics related to substance use, mental health, and drug analysis. Key research topics include:

  • Cannabis and Cannabinoid Research
  • Substance Abuse Treatment and Outcomes
  • Forensic Toxicology and Drug Analysis
  • Bipolar Disorder and Treatment
  • Prenatal Substance Exposure Effects
  • Homelessness and Social Issues
  • Schizophrenia Research and Treatment

Freeman has published extensively, frequently contributing to journals such as:

  • Addiction
  • bioRxiv (Cold Spring Harbor Laboratory)
  • International Journal of Drug Policy
  • Psychological Medicine
  • Journal of Psychopharmacology

Co-authorship collaborations have been a significant part of Freeman's research output. Regular collaborators include:

  • Will Lawn
  • Claire Mokrysz
  • Rachel Lees
  • Kat Petrilli
  • Chandni Hindocha

Notable recent papers authored or co-authored by Freeman include:

  • Changes in delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD) concentrations in cannabis over time: systematic review and meta-analysis, 2020, Addiction
  • Cannabidiol for the treatment of cannabis use disorder: a phase 2a, double-blind, placebo-controlled, randomised, adaptive Bayesian trial, 2020, The Lancet Psychiatry

Other significant studies within the data set, though not authored by Freeman, highlight the broader research context in which their work is positioned.

Best Publications

  • The contribution of cannabis use to variation in the incidence of psychotic disorder across Europe (EU-GEI): a multicentre case-control study

    Marta Di Forti;Marta Di Forti;Marta Di Forti;Diego Quattrone;Diego Quattrone;Diego Quattrone;Tom P. Freeman;Giada Tripoli

  • New trends in cannabis potency in USA and Europe during the last decade (2008-2017).

    Suman Chandra;Mohamed M Radwan;Chandrani G Majumdar;James C Church

  • Keep off the grass? Cannabis, cognition and addiction

    H. Valerie Curran;Tom P. Freeman;Claire Mokrysz;David A. Lewis

  • Impact of cannabidiol on the acute memory and psychotomimetic effects of smoked cannabis: naturalistic study

    Celia J A Morgan;Gráinne Schafer;Tom P Freeman;H Valerie Curran

  • Examining the profile of high-potency cannabis and its association with severity of cannabis dependence.

    T. P. Freeman;Adam Winstock

  • Changes in delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD) concentrations in cannabis over time: systematic review and meta-analysis.

    Tom P. Freeman;Tom P. Freeman;Sam Craft;Sam Craft;Jack Wilson;Stephan Stylianou

  • Cannabidiol attenuates the appetitive effects of Delta 9-tetrahydrocannabinol in humans smoking their chosen cannabis.

    Celia J A Morgan;Tom P Freeman;Gráinne L Schafer;H Valerie Curran

  • Adverse effects of cannabidiol: a systematic review and meta-analysis of randomized clinical trials.

    Edward Chesney;Dominic Oliver;Alastair Green;Simina Sovi

  • Sub-chronic impact of cannabinoids in street cannabis on cognition, psychotic-like symptoms and psychological well-being.

    C.J.A. Morgan;C. Gardener;G. Schafer;S. Swan

  • Medicinal use of cannabis based products and cannabinoids

    Tom P Freeman;Chandni Hindocha;Chandni Hindocha;Sebastian F Green;Michael A P Bloomfield

  • The neuropsychopharmacology of cannabis: a review of human imaging studies

    Michael A.P. Bloomfield;Chandni Hindocha;Sebastian F. Green;Matthew B. Wall

  • How does cannabidiol (CBD) influence the acute effects of delta-9-tetrahydrocannabinol (THC) in humans? A systematic review

    Abigail M. Freeman;Katherine Petrilli;Rachel Lees;Chandni Hindocha

  • 'Standard THC units': a proposal to standardize dose across all cannabis products and methods of administration.

    Tom P Freeman;Tom P Freeman;Tom P Freeman;Valentina Lorenzetti

  • Cannabidiol for the treatment of cannabis use disorder: a phase 2a, double-blind, placebo-controlled, randomised, adaptive Bayesian trial.

    Tom P Freeman;Chandni Hindocha;Chandni Hindocha;Gianluca Baio;Natacha D C Shaban

  • No Smoke without Tobacco: A Global Overview of Cannabis and Tobacco Routes of Administration and Their Association with Intention to Quit

    Chandni Hindocha;Tom P. Freeman;Jason A. Ferris;Michael T. Lynskey

  • Association of High-Potency Cannabis Use With Mental Health and Substance Use in Adolescence.

    Lindsey A Hines;Tom P Freeman;Tom P Freeman;Suzanne H Gage;Stanley Zammit;Stanley Zammit

  • Association of cannabis potency with mental ill health and addiction: a systematic review

    Unknown

  • Can we make cannabis safer

    Amir Englund;Tom P Freeman;Robin M Murray;Philip McGuire

  • Just say 'know': How do cannabinoid concentrations influence users' estimates of cannabis potency and the amount they roll in joints?

    Tom P. Freeman;Celia J. A. Morgan;Celia J. A. Morgan;Chandni Hindocha;Gráinne Schafer

  • Acute effects of delta-9-tetrahydrocannabinol, cannabidiol and their combination on facial emotion recognition: A randomised, double-blind, placebo-controlled study in cannabis users

    Chandni Hindocha;Tom P. Freeman;Grainne Schafer;Chelsea Gardener

  • Acute and chronic effects of cannabinoids on effort-related decision-making and reward learning: an evaluation of the cannabis 'amotivational' hypotheses.

    Will Lawn;Tom P. Freeman;Rebecca A. Pope;Alyssa Joye

Frequent Co-Authors

Chandni Hindocha
Chandni Hindocha Beckley Foundation
Celia J. A. Morgan
Celia J. A. Morgan University of Exeter
H. Valerie Curran
H. Valerie Curran University College London
Michael T. Lynskey
Michael T. Lynskey King's College London
Oliver D. Howes
Oliver D. Howes King's College London
Matthew B. Wall
Matthew B. Wall Imperial College London
Jim van Os
Jim van Os University Medical Center Utrecht
Ulrich Reininghaus
Ulrich Reininghaus Heidelberg University
Robin M. Murray
Robin M. Murray King's College London
Cathryn M. Lewis
Cathryn M. Lewis King's College London

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Related Online Degrees & Career Pathways

Exploring online degrees in psychology opens the door to a variety of rewarding career pathways, especially in counseling and education. Many students consider becoming school counselors, a profession that offers a direct way to make a positive impact on young people’s lives. However, it’s important to understand that requirements can vary greatly depending on the state.

For instance, if you're interested in learning how to become a school counselor in Texas, you’ll need a master’s degree in counseling and specific certifications unique to Texas. In comparison, Utah has its own set of guidelines, which are detailed under the Utah school counselor education requirements.

The path to school counseling is also unique in Vermont, where students can review the steps outlined in how to become a school counselor in Vermont. Likewise, the Virginia school counselor education requirements highlight the differences in coursework, licensing, and supervised experience.

With online degrees now widely accepted and flexible, pursuing a career in psychology—from clinical practice to school counseling—is more accessible than ever.

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