World's Best Scientists 2026 revealed!

D-Index & Metrics

Psychology

D-Index
40
Citations
6251
World Ranking
8279
National Ranking
4425

Valerie S. Knopik 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 Valerie S. Knopik 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: 157 publications — 53rd percentile

53% of scientists in this discipline score the same or lower.

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

Valerie S. Knopik 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 Valerie S. Knopik 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: 40 D-Index — 30th percentile

30% of scientists in this discipline score the same or lower.

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

Overview

Valerie S. Knopik is affiliated with Purdue University West Lafayette in the United States. Their research focuses on integrating multiple disciplines within medicine and psychology, particularly emphasizing clinical psychology and genetics.

The scientist's work primarily explores topics such as child and adolescent psychosocial and emotional development, birth, development, and health, early childhood education and development, smoking behavior and cessation, genetic mapping and diversity in plants and animals, prenatal substance exposure effects, and health, environment, and cognitive aging.

Valerie S. Knopik has contributed to several notable publications. Recent papers include:

  • Multi-omic and multi-species meta-analyses of nicotine consumption, 2021, Translational Psychiatry
  • Neurofibromatosis Type 1 Implicates Ras Pathways in the Genetic Architecture of Neurodevelopmental Disorders, 2020, Behavior Genetics
  • Intergenerational transmission of psychopathology: An examination of symptom severity and directionality, 2022, Development and Psychopathology
  • DNA methylome perturbations: an epigenetic basis for the emergingly heritable neurodevelopmental abnormalities associated with maternal smoking and maternal nicotine exposure, 2021, Biology of Reproduction
  • Multi-type childhood maltreatment exposure and substance use development from adolescence to early adulthood: A GxE study, 2022, Child Abuse & Neglect

Frequent co-authors working alongside Valerie S. Knopik include:

  • Kristine Marceau
  • Rohan H. C. Palmer
  • Leslie A. Brick
  • Chelsie E. Benca-Bachman
  • John E. McGeary

The scientist's research is regularly published in venues such as Behavior Genetics, Development and Psychopathology, Translational Psychiatry, Biology of Reproduction, and Child Abuse & Neglect. The number of papers published at these venues highlights areas of focused interest, with Behavior Genetics and Development and Psychopathology being frequent platforms for their work.

Valerie S. Knopik's work spans several subfields, notably clinical psychology, genetics, pediatrics, perinatology and child health, education, and physiology. These interdisciplinary approaches contribute to a comprehensive understanding of developmental and genetic factors influencing human health and behavior.

Best Publications

  • Top 10 replicated findings from behavioral genetics.

    Robert Plomin;John C. DeFries;Valerie S. Knopik;Jenae M. Neiderhiser

  • The epigenetics of maternal cigarette smoking during pregnancy and effects on child development.

    Valerie S. Knopik;Matthew A. Maccani;Sarah Francazio;John E. McGeary

  • Maternal Smoking During Pregnancy and Child Outcomes: Real or Spurious Effect?

    Valerie S. Knopik

  • Maternal alcohol use disorder and offspring ADHD: disentangling genetic and environmental effects using a children-of-twins design.

    Valerie S. Knopik;Andrew C. Heath;Theodore Jacob;Wendy S. Slutske

  • Allelic variation in TAS2R bitter receptor genes associates with variation in sensations from and ingestive behaviors toward common bitter beverages in adults.

    John E. Hayes;Margaret R. Wallace;Valerie S. Knopik;Deborah M. Herbstman

  • Contributions of parental alcoholism, prenatal substance exposure, and genetic transmission to child ADHD risk: a female twin study

    Valerie S. Knopik;Elizabeth P. Sparrow;Pamela A. F. Madden;Kathleen K. Bucholz

  • Quantitative trait locus for reading disability on chromosome 6p is pleiotropic for attention-deficit/hyperactivity disorder.

    Erik G. Willcutt;Bruce F. Pennington;Shelley D. Smith;Lon R. Cardon

  • Genetic effects on alcohol dependence risk: re-evaluating the importance of psychiatric and other heritable risk factors.

    Valerie S. Knopik;Andrew C. Heath;Pamela A. F. Madden;Kathleen K. Bucholz

  • Comorbidity of mathematics and reading deficits: Evidence for a genetic etiology.

    Valerie S. Knopik;Maricela Alarcón;John C. DeFries

  • Etiology of reading difficulties and rapid naming: the Colorado Twin Study of Reading Disability.

    Chayna J. Davis;Javier Gayán;Valerie S. Knopik;Shelley D. Smith

  • Examining the role of common genetic variants on alcohol, tobacco, cannabis and illicit drug dependence: genetics of vulnerability to drug dependence.

    Rohan H. C. Palmer;Rohan H. C. Palmer;Leslie Brick;Nicole R. Nugent;Nicole R. Nugent;L. Cinnamon Bidwell;L. Cinnamon Bidwell

  • Genetic and Environmental Overlap between Low Self-Control and Delinquency

    Danielle Boisvert;John Paul Wright;Valerie Knopik;Jamie Vaske

  • 5-HTTLPR and BDNF Val66Met polymorphisms moderate effects of stress on rumination.

    Peter C. Clasen;Tony T. Wells;Valerie S. Knopik;John E. McGeary

  • Associations of the DRD2 TaqIA Polymorphism with Impulsivity and Substance Use: Preliminary Results from a Clinical Sample of Adolescents

    Christianne Esposito-Smythers;Anthony Spirito;Christie Rizzo;John E. McGeary;John E. McGeary

  • Bitterness of the Non-nutritive Sweetener Acesulfame Potassium Varies With Polymorphisms in TAS2R9 and TAS2R31

    Alissa L. Allen;John E. McGeary;Valerie S. Knopik;Valerie S. Knopik;John E. Hayes

  • Cue-Elicited Increases in Incentive Salience for Marijuana: Craving, Demand, and Attentional Bias

    Jane Metrik;Jane Metrik;Elizabeth R. Aston;Christopher W. Kahler;Damaris J. Rohsenow;Damaris J. Rohsenow

  • Correlates of Cigarette Smoking During Pregnancy and Its Genetic and Environmental Overlap with Nicotine Dependence

    Arpana Agrawal;Valerie S. Knopik;Michele L. Pergadia;Mary Waldron

  • Genetic epidemiology of alcohol-induced blackouts.

    Elliot C. Nelson;Andrew C. Heath;Kathleen K. Bucholz;Pamela A. F. Madden

  • Initial evidence of an association between OPRM1 and adolescent alcohol misuse.

    Robert Miranda;Lara Ray;Alicia Justus;Lori A. Meyerson

  • Genetic and environmental influences on externalizing behavior and alcohol problems in adolescence: A female twin study

    Valerie S. Knopik;Andrew C. Heath;Kathleen K. Bucholz;Pamela A.F. Madden

Frequent Co-Authors

John E. McGeary
John E. McGeary Brown University
Andrew C. Heath
Andrew C. Heath Washington University in St. Louis
Pamela A. F. Madden
Pamela A. F. Madden Washington University in St. Louis
L. Cinnamon Bidwell
L. Cinnamon Bidwell University of Colorado Boulder
John C. DeFries
John C. DeFries University of Colorado Boulder
Kathleen K. Bucholz
Kathleen K. Bucholz Washington University in St. Louis
Jane Metrik
Jane Metrik Brown University
James MacKillop
James MacKillop McMaster University
Damaris J. Rohsenow
Damaris J. Rohsenow Brown University
Brandon E. Gibb
Brandon E. Gibb Binghamton University

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Related Online Degrees & Career Pathways

Thinking about a career in psychology? There are several related online degrees and career paths you can explore. For example, becoming a speech-language pathologist (SLP) is a popular choice for those interested in communication science and disorders. SLPs help people with speech, language, and swallowing issues, often working in schools, hospitals, or private clinics.

If you’re considering this field, it’s important to know that each state has its own certification requirements for speech pathologists. For instance, Arkansas speech pathologist certification requirements include specific education, exam, and clinical experience milestones. On the West Coast, California slp certification requirements emphasize supervised clinical work and state exams.

In other states, like Colorado slp certification requirements and Connecticut speech pathologist certification requirements, applicants must also complete accredited degree programs and pass the national Praxis exam.

No matter which state you choose, online psychology and related degree programs can prepare you for versatile and rewarding career pathways, including speech-language pathology and other specialized roles in behavioral health.

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