World's Best Scientists 2026 revealed!

D-Index & Metrics

Psychology

D-Index
100
Citations
35560
World Ranking
626
National Ranking
398

Overview

John K. Hewitt is affiliated with the University of Colorado Boulder in the United States. Their research spans multiple domains within medicine and psychology, with a focus on genetics, clinical psychology, experimental and cognitive psychology, artificial intelligence, and pharmacology.

The main topics covered in their work include:

  • Child and Adolescent Psychosocial and Emotional Development
  • Genetic Associations and Epidemiology
  • Substance Abuse Treatment and Outcomes
  • Cannabis and Cannabinoid Research
  • Cognitive Abilities and Testing
  • Attention Deficit Hyperactivity Disorder
  • Prenatal Substance Exposure Effects

Key publications by John K. Hewitt include:

  • Genetic diversity fuels gene discovery for tobacco and alcohol use (2022, Nature)
  • A large-scale genome-wide association study meta-analysis of cannabis use disorder (2020, The Lancet Psychiatry)
  • Multivariate genome-wide association meta-analysis of over 1 million subjects identifies loci underlying multiple substance use disorders (2023, Nature Mental Health)
  • Screen time and early adolescent mental health, academic, and social outcomes in 9- and 10-year-old children: Utilizing the Adolescent Brain Cognitive Development ℠ (ABCD) Study (2021, PLoS ONE)
  • Leveraging genome-wide data to investigate differences between opioid use vs. opioid dependence in 41,176 individuals from the Psychiatric Genomics Consortium (2020, Molecular Psychiatry)

Frequent co-authors of this researcher include:

  • Robin P. Corley
  • Christian J. Hopfer
  • William G. Iacono
  • Michael C. Stallings
  • Hermine H. Maes

Publication venues where John K. Hewitt has frequently published include:

  • Behavior Genetics
  • UNC Libraries
  • arXiv (Cornell University)
  • bioRxiv (Cold Spring Harbor Laboratory)
  • Drug and Alcohol Dependence

Their work often reflects interdisciplinary approaches combining genetic epidemiology and psychological research to explore substance use disorders and developmental outcomes. The broad range of publication venues and frequent collaborations suggests active engagement in the research community focused on genetics, mental health, and substance abuse.

Best Publications

  • Individual differences in executive functions are almost entirely genetic in origin

    Naomi P. Friedman;Akira Miyake;Susan E. Young;John C. DeFries

  • Not All Executive Functions Are Related to Intelligence

    Naomi P. Friedman;Akira Miyake;Robin P. Corley;Susan E. Young

  • Image processing and analysis methods for the Adolescent Brain Cognitive Development Study.

    Donald J. Hagler;Sean N. Hatton;M. Daniela Cornejo;Carolina Makowski

  • The heritability of general cognitive ability increases linearly from childhood to young adulthood

    Claire M. A. Haworth;M. J. Wright;M. Luciano;N. G. Martin

  • Genetics and Developmental Psychopathology: 2. The Main Effects of Genes and Environment on Behavioral Problems in the Virginia Twin Study of Adolescent Behavioral Development

    Lindon J. Eaves;Judy L. Silberg;Joanne M. Meyer;Hermine H. Maes

  • Transancestral GWAS of alcohol dependence reveals common genetic underpinnings with psychiatric disorders

    Raymond K. Walters;Raymond K. Walters;Renato Polimanti;Emma C. Johnson;Jeanette N. McClintick

  • The Influence of Genetic Factors and Life Stress on Depression Among Adolescent Girls

    Judy L. Silberg;Andrew Pickles;Michael Rutter;John Hewitt

  • Genetic and environmental influences on behavioral disinhibition.

    Susan E. Young;Michael C. Stallings;Robin P. Corley;Kenneth S. Krauter

  • Combined Linkage and Association Sib-Pair Analysis for Quantitative Traits

    D.W. Fulker;D.W. Fulker;S.S. Cherny;S.S. Cherny;P.C. Sham;J.K. Hewitt

  • Behavioral disinhibition: liability for externalizing spectrum disorders and its genetic and environmental relation to response inhibition across adolescence.

    Susan E. Young;Naomi P. Friedman;Akira Miyake;Erik G. Willcutt

  • Substance use, abuse and dependence in adolescence: prevalence, symptom profiles and correlates

    S.E Young;R.P Corley;M.C Stallings;S.H Rhee

  • Genetic and Environmental Influences on Substance Initiation, Use, and Problem Use in Adolescents

    Soo Hyun Rhee;John K. Hewitt;Susan E. Young;Robin P. Corley

  • Developmental Trajectories in Toddlers’ Self-restraint Predict Individual Differences in Executive Functions 14 Years Later: A Behavioral Genetic Analysis

    Naomi P. Friedman;Akira Miyake;JoAnn L. Robinson;John K. Hewitt

  • Candidate gene-environment interaction research: reflections and recommendations.

    Danielle M. Dick;Arpana Agrawal;Matthew C. Keller;Amy Adkins

  • The Virginia Twin Study of Adolescent Behavioral Development: Influences of Age, Sex, and Impairment on Rates of Disorder

    Emily Simonoff;Andrew Pickles;Joanne M. Meyer;Judy L. Silberg

  • Structure and etiology of co-occurring internalizing and externalizing disorders in adolescents.

    Victoria E. Cosgrove;Victoria E. Cosgrove;Soo H. Rhee;Heather L. Gelhorn;Debra Boeldt

  • Testing structural equation models for twin data using LISREL.

    Andrew Heath;M. C. Neale;J. K. Hewitt;L. J. Eaves

  • Developmental epidemiology of drug use and abuse in adolescence and young adulthood: Evidence of generalized risk.

    Rohan H. Palmer;S. E. Young;C. J. Hopfer;R. P. Corley

  • Genetic and Environmental Influences on the Covariation Between Hyperactivity and Conduct Disturbance in Juvenile Twins

    Judy L. Silberg;Michael Rutter;Joanne Meyer;Hermine Maes

  • A large-scale genome-wide association study meta-analysis of cannabis use disorder

    Emma C Johnson;Ditte Demontis;Thorgeir E Thorgeirsson;Raymond K Walters

  • Genetic and Environmental Structure of the Tridimensional Personality Questionnaire: Three or Four Temperament Dimensions?

    M C Stallings;J K Hewitt;C R Cloninger;A C Heath

Frequent Co-Authors

Robin P. Corley
Robin P. Corley University of Colorado Boulder
Michael C. Stallings
Michael C. Stallings University of Colorado Boulder
Soo Hyun Rhee
Soo Hyun Rhee University of Colorado Boulder
Brett C. Haberstick
Brett C. Haberstick University of Colorado Boulder
William G. Iacono
William G. Iacono University of Minnesota
Nicholas G. Martin
Nicholas G. Martin QIMR Berghofer Medical Research Institute
Matt McGue
Matt McGue University of Minnesota
Sandra A. Brown
Sandra A. Brown University of California, San Diego
Joel Gelernter
Joel Gelernter Yale University
Pamela A. F. Madden
Pamela A. F. Madden Washington University in St. Louis

If you think any of the details on this page are incorrect, let us know.

Report an issue

We appreciate your kind effort to assist us to improve this page, it would be helpful providing us with as much detail as possible in the text box below:

Related Online Degrees & Career Pathways

Exploring psychology in the USA opens up a variety of online degree options and career pathways. Many students are drawn to flexible, accredited programs that allow them to balance studies with other commitments. Online degrees in psychology or counseling provide foundational knowledge and practical skills needed in mental health, education, social services, and more.

For those interested in counseling, accelerated pathways are available in several states. Each state has unique requirements, so researching the best options is essential. For example, you can learn about Montana fastest counseling programs to discover programs designed for quick entry into the field. Similarly, Nebraska accelerated counseling programs offer ways to complete your studies efficiently.

If you are pursuing licensure or rapid career advancement elsewhere, look into Nevada accelerated counseling programs or New Hampshire fastest counseling programs. These programs are tailored for students eager to join the workforce and make a difference as soon as possible.

Best Scientists Citing John K. Hewitt

Trending Scientists