World's Best Scientists 2026 revealed!
Leonard A. Jason

Leonard A. Jason

D-Index & Metrics

Psychology

D-Index
81
Citations
26264
World Ranking
1379
National Ranking
828

Leonard A. Jason 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 Leonard A. Jason 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: 849 publications — 100th percentile

100% of scientists in this discipline score the same or lower.

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

Leonard A. Jason 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 Leonard A. Jason 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: 81 D-Index — 88th percentile

88% of scientists in this discipline score the same or lower.

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

Research.com Recognitions

  • 2015 - APA Award for Distinguished Professional Contributions to Applied Research
  • 1983 - Fellow of the American Psychological Association (APA)

Overview

Leonard A. Jason is affiliated with DePaul University in the United States and has made significant contributions to the fields of Medicine and Health Professions. Their research spans a range of subfields including General Health Professions, Psychiatry and Mental Health, Clinical Psychology, Epidemiology, and Neurology.

The primary focus of their work involves topics such as Fibromyalgia and Chronic Fatigue Syndrome Research, Homelessness and Social Issues, Substance Abuse Treatment and Outcomes, Long-Term Effects of COVID-19, Health Disparities and Outcomes, COVID-19 and Mental Health, and broader Health, Psychology, and Well-being.

Recent publications include:

  • ME/CFS and Post-Exertional Malaise among Patients with Long COVID (2022), published in Neurology International
  • COVID-19 Symptoms Over Time: Comparing Long-Haulers to ME/CFS (2021), published in Fatigue Biomedicine Health & Behavior
  • Updating the National Academy of Medicine ME/CFS Prevalence and Economic Impact Figures to Account for Population Growth and Inflation (2021), published in Fatigue Biomedicine Health & Behavior

Other papers relevant to their research interests but authored by collaborators include:

  • Post-Viral Fatigue and COVID-19: Lessons from Past Epidemics (2020), published in Fatigue Biomedicine Health & Behavior
  • Medical Care Situation of People with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome in Germany (2021), published in Medicina

Their frequent co-authors include Ted J. Bobak, Mohammed F. Islam, Mayra Guerrero, Joseph Cotler, and John M. Light.

Leonard A. Jason has published extensively in venues such as:

  • Fatigue Biomedicine Health & Behavior
  • Alcoholism Treatment Quarterly
  • Journal of Community Psychology
  • Journal of Prevention & Intervention in the Community
  • Journal of Social Work Practice in the Addictions

The researcher's work has been recognized through awards including the APA Award for Distinguished Professional Contributions to Applied Research in 2015 and fellowship in the American Psychological Association established in 1983.

Best Publications

  • A community-based study of chronic fatigue syndrome.

    Leonard A. Jason;Judith A. Richman;Alfred W. Rademaker;Karen M. Jordan

  • Identification of ambiguities in the 1994 chronic fatigue syndrome research case definition and recommendations for resolution.

    William C Reeves;Andrew Lloyd;Suzanne D Vernon;Nancy Klimas

  • A social stress model of substance abuse.

    Jean E. Rhodes;Leonard A. Jason

  • Active enforcement of cigarette control laws in the prevention of cigarette sales to minors.

    Leonard A. Jason;Peter Y. Ji;Michael D. Anes;Scott H. Birkhead

  • Pretrauma risk factors for posttraumatic stress disorder: A systematic review of the literature

    Julia A. DiGangi;Daisy Gomez;Leslie Mendoza;Leonard A. Jason

  • Participatory Community Research: Theories and Methods in Action

    Leonard A. Jason;Christopher B. Keys;Yolanda Suarez-Balcazar;Renée R. Taylor

  • The need for substance abuse after-care: Longitudinal analysis of Oxford House

    Leonard A. Jason;Leonard A. Jason;Margaret I. Davis;Margaret I. Davis;Joseph R. Ferrari;Joseph R. Ferrari

  • Social network variables in alcoholics anonymous: A literature review

    D. R. Groh;Leonard A. Jason;C. B. Keys

  • Communal Housing Settings Enhance Substance Abuse Recovery

    Leonard A. Jason;Bradley D. Olson;Joseph R. Ferrari;Anthony T. Lo Sasso

  • Post-viral fatigue and COVID-19: lessons from past epidemics

    Mohammed F. Islam;Joseph Cotler;Leonard A. Jason

  • Earn per view television viewing regulation device

    Leonard A. Jason

  • Preventing substance abuse among children and adolescents

    Jean E. Rhodes;Leonard A. Jason

  • Pilot Study Examining Factors Associated with Academic Success for Hispanic High School Students.

    Olga Reyes;Leonard A. Jason

  • The Development of a Revised Canadian Myalgic Encephalomyelitis Chronic Fatigue Syndrome Case Definition

    Leonard A. Jason;Meredyth Evans;Nicole Porter;Molly Brown

  • Understanding Chronic Fatigue Syndrome: An Empirical Guide to Assessment and Treatment

    Fred Friedberg;Leonard A. Jason

  • The Economic impact of ME/CFS: Individual and societal costs

    Leonard A. Jason;Mary C. Benton;Lisa M. Valentine;Abra Johnson

  • Chronic Fatigue Syndrome: The Need for Subtypes

    Leonard A. Jason;Karina Corradi;Susan Torres-Harding;Renee R. Taylor

  • What is fatigue? Pathological and nonpathological fatigue.

    Leonard A. Jason;Meredyth Evans;Molly Brown;Nicole Porter

  • Pacing as a strategy to improve energy management in myalgic encephalomyelitis/chronic fatigue syndrome: a consensus document

    Ellen M. Goudsmit;Jo Nijs;Leonard A. Jason;Karen E. Wallman

  • Researching community psychology : issues of theory and methods

    Patrick Tolan;Christopher Keys;Fern Chertok;Leonard A. Jason

  • Handbook of Methodological Approaches to Community-Based Research: Qualitative, Quantitative, and Mixed Methods

    Leonard A. Jason;David S. Glenwick

  • Stress and coping: the roles of ethnicity and gender in substance abuse recovery.

    Justin T. Brown;Margaret I. Davis;Leonard A. Jason;Joseph R. Ferrari

Frequent Co-Authors

Joseph R. Ferrari
Joseph R. Ferrari DePaul University
Judith A. Richman
Judith A. Richman University of Illinois at Chicago
Susan D. McMahon
Susan D. McMahon DePaul University
Christopher B. Keys
Christopher B. Keys DePaul University
Alfred W. Rademaker
Alfred W. Rademaker Northwestern University
Adam W. Carrico
Adam W. Carrico University of Miami
Brian R. Flay
Brian R. Flay Boise State University
Stephen B. Fawcett
Stephen B. Fawcett University of Kansas
Mary A Fletcher
Mary A Fletcher Nova Southeastern University
Warren W. Tryon
Warren W. Tryon Fordham University

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