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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Psychology 36 9595 8976 5069 4624 136 4724

John D. Clapp publications per year

The chart shows the history of publications by John D. Clapp between 1993 and 2024, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. John D. Clapp published across 32 years, from 1993 to 2024, averaging 4.7 papers a year. Output peaked at 12 publications in 2011. 5 of the 151 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1993 to 2024. Vertical axis: number of publications, 0 to 12. Peak 12 publications in 2011. 1993: 2 publications 1994: 0 publications 1995: 1 publication 1996: 1 publication 1997: 2 publications 1998: 1 publication 1999: 3 publications 2000: 7 publications 2001: 6 publications 2002: 6 publications 2003: 6 publications 2004: 2 publications 2005: 5 publications 2006: 7 publications 2007: 5 publications 2008: 5 publications 2009: 6 publications 2010: 10 publications 2011: 12 publications 2012: 5 publications 2013: 3 publications 2014: 10 publications 2015: 4 publications 2016: 7 publications 2017: 7 publications 2018: 5 publications 2019: 3 publications 2020: 4 publications 2021: 7 publications 2022: 4 publications 2023: 4 publications 2024: 1 publication
1993 2024

151 publications in total across all disciplines

View publications per year as a table
John D. Clapp: publications per year, 1993 to 2024
Year Publications
1993 2
1994 0
1995 1
1996 1
1997 2
1998 1
1999 3
2000 7
2001 6
2002 6
2003 6
2004 2
2005 5
2006 7
2007 5
2008 5
2009 6
2010 10
2011 12
2012 5
2013 3
2014 10
2015 4
2016 7
2017 7
2018 5
2019 3
2020 4
2021 7
2022 4
2023 4
2024 1
Total 151
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John D. Clapp 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 John D. Clapp sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 69 bars. Horizontal axis: publications, 31–40 to 705+. Vertical axis: number of scientists, 0 to 736. Most scientists, 736, have 101–110 publications. The last bar groups every scientist with 705 publications or more. The highlighted bar, 131–140 publications, is where this scientist sits. 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
31–40 publications 705+

This scientist: 136 publications — 42nd percentile

42% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Psychology scientists by publication count, Research.com 2026 ranking edition. Based on 11,416 ranked scientists.
Publications Scientists This scientist
31–40 6
41–50 52
51–60 138
61–70 299
71–80 461
81–90 605
91–100 713
101–110 736
111–120 686
121–130 670
131–140 644 136
141–150 597
151–160 576
161–170 477
171–180 450
181–190 397
191–200 343
201–210 328
211–220 313
221–230 283
231–240 226
241–250 196
251–260 201
261–270 171
271–280 151
281–290 139
291–300 113
301–310 102
311–320 100
321–330 76
331–340 92
341–350 85
351–360 69
361–370 71
371–380 63
381–390 58
391–400 57
401–410 43
411–420 33
421–430 50
431–440 41
441–450 32
451–460 27
461–470 28
471–480 25
481–490 28
491–500 20
501–510 23
511–520 26
521–530 17
531–540 21
541–550 14
551–560 16
561–570 10
571–580 22
581–590 9
591–600 14
601–610 9
611–620 11
621–630 4
631–640 7
641–650 5
651–660 10
661–670 8
671–680 8
681–690 4
691–700 3
701–704 4
705+ 100
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John D. Clapp 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 John D. Clapp sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 58 bars. Horizontal axis: D-Index, 30–31 to 144+. Vertical axis: number of scientists, 0 to 702. Most scientists, 702, have 32–33 D-Index. The last bar groups every scientist with 144 D-Index or more. The highlighted bar, 36–37 D-Index, is where this scientist sits. 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
30–31 D-Index 144+

This scientist: 36 D-Index — 19th percentile

19% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Psychology scientists by D-index, Research.com 2026 ranking edition. Based on 11,416 ranked scientists.
D-Index Scientists This scientist
30–31 398
32–33 702
34–35 671
36–37 659 36
38–39 641
40–41 671
42–43 617
44–45 558
46–47 495
48–49 487
50–51 445
52–53 390
54–55 408
56–57 345
58–59 325
60–61 321
62–63 248
64–65 290
66–67 218
68–69 219
70–71 215
72–73 183
74–75 169
76–77 132
78–79 137
80–81 120
82–83 112
84–85 86
86–87 101
88–89 83
90–91 77
92–93 70
94–95 78
96–97 58
98–99 53
100–101 57
102–103 48
104–105 53
106–107 46
108–109 24
110–111 35
112–113 27
114–115 32
116–117 31
118–119 22
120–121 16
122–123 24
124–125 18
126–127 11
128–129 19
130–131 10
132–133 16
134–135 10
136–137 12
138–139 8
140–141 5
142–143 12
144+ 98
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Overview

John D. Clapp is affiliated with the University of Southern California in the United States. Their research primarily spans the fields of medicine and psychology, with a focus on epidemiology, pediatrics, perinatology and child health, public health, environmental and occupational health, sociology, political science, and clinical psychology.

The main topics in Clapp's work include substance abuse treatment and outcomes, behavioral health and interventions, prenatal substance exposure effects, opioid use disorder treatment, the impact of technology on adolescents, COVID-19 and mental health, and cardiac arrest and resuscitation.

Some of the recent papers authored or co-authored by Clapp are:

  • Conceptualizing stigma in contexts of pregnancy and opioid misuse: A qualitative study with women and healthcare providers in Ohio, 2021, Drug and Alcohol Dependence
  • Sex differences in factors predicting post-treatment opioid use, 2021, Addiction
  • Zoom (Virtual) Happy Hours and Drinking During COVID-19 in the US: An Exploratory Qualitative Study, 2021, Health Behavior and Policy Review
  • Moral Injury is a Risk Factor for Substance Use and Suicidality Among US Military Veterans with and without Traumatic Brain Injury, 2023, Journal of Religion and Health
  • Multifaceted impulsivity as a moderator of social anxiety and cannabis use during pregaming, 2020, Journal of Anxiety Disorders

Frequent co-authors collaborating with Clapp include:

  • Jordan P. Davis
  • Eric R. Pedersen
  • Justin F. Hummer
  • Danielle R. Madden
  • Nina C. Christie

The most common venues for their publications comprise:

  • Drug and Alcohol Dependence
  • Addiction
  • Health Behavior and Policy Review
  • Journal of Religion and Health
  • Journal of Anxiety Disorders

Best Publications

  • The relationship between alcohol use and cigarette smoking in a sample of undergraduate college students.

    Mark B. Reed;Rong Wang;Audrey M. Shillington;John D. Clapp

  • The relationship of perceptions of alcohol promotion and peer drinking norms to alcohol problems reported by college students.

    John D. Clapp;Anita Lyn McDonnell

  • A failed norms social marketing campaign.

    John D. Clapp;James Evan Lange;Cristel Russell;Audrey Shillington

  • Deconstructing contexts of binge drinking among college students

    John D. Clapp;Audrey M. Shillington;Lance B. Segars

  • Drunk in public, drunk in private: the relationship between college students, drinking environments and alcohol consumption.

    J. D. Clapp;M. B. Reed;M. R. Holmes;James Evan Lange

  • Self-report stability of adolescent substance use: are there differences for gender, ethnicity and age?

    Audrey M. Shillington;J. D. Clapp

  • The relationship between social identity, normative information, and college student drinking

    Mark B. Reed;James E. Lange;Julie M. Ketchie;John D. Clapp

  • Environmental predictors of heavy episodic drinking.

    John D. Clapp;Audrey M. Shillington

  • Predictors of substance use among homeless youth in San Diego.

    Chad A. Bousman;Elaine J. Blumberg;Audrey M. Shillington;Melbourne Frank Hovell

  • Salvia divinorum: effects and use among YouTube users.

    James Evan Lange;Jason Daniel;Kestrel Homer;Mark B. Reed

  • Substance use problems reported by college students: combined marijuana and alcohol use versus alcohol-only use

    Audrey M. Shillington;John D. Clapp

  • Ideology and Social Work Practice in Substance Abuse Settings

    Anna Celeste Burke;John D. Clapp

  • Measuring college students' alcohol consumption in natural drinking environments: field methodologies for bars and parties.

    John D. Clapp;Megan R. Holmes;Mark B. Reed;Audrey M. Shillington

  • College student use of Salvia divinorum

    James E. Lange;Mark B. Reed;Julie M. Ketchie Croff;John D. Clapp

  • Does proximity to retailers influence alcohol and tobacco use among Latino adolescents

    Joshua H. West;Elaine J. Blumberg;Norma J. Kelley;Linda L. Hill;Linda L. Hill

  • Reducing DUI among US College Students: Results of an Environmental Prevention Trial

    John D Clapp;Mark Johnson;Robert B Voas;James E Lange

  • Two studies examining environmental predictors of heavy drinking by college students.

    John D. Clapp;Jon Wong Min;Audrey Shillington

  • Person and Environment Predictors of Blood Alcohol Concentrations: A Multi-Level Study of College Parties

    John D. Clapp;Jong Won Min;Audrey M. Shillington;Mark B. Reed

  • College Undergraduate Ritalin Abusers in Southwestern California: Protective and Risk Factors:

    Audrey M. Shillington;Mark B. Reed;James Evan Lange;John D. Clapp

  • Blood alcohol concentrations among bar patrons: a multi-level study of drinking behavior.

    John D. Clapp;Mark B. Reed;Jong W. Min;Audrey M. Shillington

  • RAISING THE BAR: PREVENTING AGGRESSION IN AND AROUND BARS, PUBS AND CLUBS

    John D. Clapp

Frequent Co-Authors

Samantha Wells
Samantha Wells Centre for Addiction and Mental Health
Robert B. Voas
Robert B. Voas Pacific Institute For Research and Evaluation
Melbourne F. Hovell
Melbourne F. Hovell San Diego State University
Ryan S. Trim
Ryan S. Trim University of California, San Diego
Kevin M. Passino
Kevin M. Passino The Ohio State University
Tanya Chikritzhs
Tanya Chikritzhs Curtin University
Kathryn Graham
Kathryn Graham Centre for Addiction and Mental Health
Eric R. Pedersen
Eric R. Pedersen University of Southern California
Justin F. Hummer
Justin F. Hummer RAND Corporation
Steffanie A. Strathdee
Steffanie A. Strathdee University of California, San Diego

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