Peer-reviewed research & writing

Which school experiences matter? A co-twin control analysis of putative mediators linking childhood ADHD to adult educational attainment

Mohan, A., Berry, D., Iacono, W. G., … Schaefer, J. D. · Journal of Clinical Child & Adolescent Psychology

Phenotypic heterogeneity in pediatric ADHD: Functional correlates of comorbidity profiles in a national sample

Mohan, A., Schaefer, J. D. · Journal of Clinical Child & Adolescent Psychology

Nicotine use and psychoticism: A longitudinal co-twin control analysis

Sloan, A. F., Alexander, J. D., Ellingson, J. M., … Schaefer, J. D. · Journal of Psychopathology and Clinical Science

Socioeconomic consequences of childhood ADHD: A longitudinal twin study

Mohan, A., Iacono, W. G., McGue, M., … Schaefer, J. D. · Journal of the American Academy of Child & Adolescent Psychiatry

Challenges with measuring emerging mental health symptoms during the transition to adolescence: Symptom dimensions, reporters, and contexts in the Adolescent Brain Cognitive Development (ABCD) Study

Martinez, M., Mittal, V. A., Haase, C. M., Schaefer, J. D., Damme, K. S. · JCPP Advances

Distinct ERP biomarkers of broad versus specific dimensions of the HiTOP externalizing spectrum

Patrick, C. J., Ribes-Guardiola, P., … Schaefer, J., et al. · Clinical Psychological Science

The lasting impact of youth bullying exposure on adult labor market outcomes: An inter-disciplinary review of the literature

Martinez, M., Hu, Q., Schaefer, J. D. · Developmental Review, 80, 101269

Predicting externalizing symptom trajectories in U.S. National Guard recruits: The role of adverse childhood experiences

Sloan, A. F., Bron, T., Marquardt, C. A., … Schaefer, J. D. · Journal of Traumatic Stress, 39, 282-294

A case for change in policy: An integrative conceptual framework to promote more conversations about race/ethnicity in school contexts

Del Toro, J., Luciana, M., Schaefer, J. D., Wilson, S., Lee, R. M. · American Psychologist, 81, 344-359

Associations between cannabis use frequency and suicidal thoughts and behaviors: A clinical longitudinal sibling study

Stern, E. F., Ellingson, J. M., Schaefer, J. D., et al. · Addictive Behaviors Reports, 22, 100620

Can a warm and supportive adult protect against mental health problems amongst children with experience of adversity? A twin-difference study

Stock, S. E., Lacey, R. E., Arseneault, L., … Schaefer, J. D., Baldwin, J. R. · Journal of Child Psychology & Psychiatry, 66(5), 650–658

Clarifying the place of P300 in the empirical structure of psychopathology over development

Perkins, E. R., Harper, J., Schaefer, J. D., et al. · Journal of Psychopathology and Clinical Science, 133(8), 733–744

Limited psychological and social effects of lifetime cannabis use frequency: Evidence from a 30-year community study of 4,078 twins

Zellers, S., Alexander, J., Ellingson, J. M., et al. · Journal of Psychopathology and Clinical Science, 133(1), 115–128

Adaptation in young military recruits: Protocol for the Advancing Research on Mechanisms of Resilience (ARMOR) prospective longitudinal study

Polusny, M. A., Marquardt, C. A., Hubbling, M., … Schaefer, J. D., et al. · JMIR Research Protocols, 12(1), e51235

Pubertal timing and adolescent outcomes: Investigating explanations for associations with a genetically informed design

Padrutt, E. R., Harper, J., Schaefer, J. D., et al. · Journal of Child Psychology and Psychiatry, 64(8), 1232–1241

The effects of adolescent cannabis use on psychosocial functioning

Schaefer, J. D., Nelson, K., Wilson, S. · Child and Adolescent Psychiatric Clinics of North America, 32(6), 43–55

Sensitive periods in development and risk for psychiatric disorders and related endpoints: A systematic review of child maltreatment findings

Schaefer, J. D., Cheng, T., Dunn, E. C. · The Lancet Psychiatry, 9(12), 978–991

Alcohol and nicotine polygenic scores are associated with the development of alcohol and nicotine use problems from adolescence to young adulthood

Deak, J., Clark, D., Liu, M., et al. · Addiction, 117, 1117–1127

Parental educational attainment and frequency of marijuana use in youth: Hispanics’ diminished returns

Assari, S. & Schaefer, J. D. · Journal of Educational and Cultural Studies, 5(6), 47–60

Associations between polygenic risk of substance use and use disorder and alcohol, cannabis, and nicotine use in adolescence and young adulthood in a longitudinal twin study

Schaefer, J. D., Jang, S., Clark, D. A., et al. · Psychological Medicine, 1–11

Advancing Research on Mechanisms of Resilience (ARMOR) longitudinal cohort study of new military recruits: Results from a feasibility pilot study

Polusny, M. A., Marquadt, C. A., Campbell, E. H., et al. · Research in Human Development, 18(3), 212–229

Polygenic scores for smoking and educational attainment have independent influences on academic success and adjustment in adolescence and educational attainment in adulthood

Hicks, B. M., Clark, D. A., Deak, J. D., et al. · PLOS ONE, 16(8), e0255348

Adolescent cannabis use and adult psychoticism: A longitudinal co-twin control analysis using data from two cohorts

Schaefer, J. D., Jang, S., Vrieze, S., et al. · Journal of Abnormal Psychology, 130(7), 691–701

Association of air pollution exposure in childhood and adolescence with psychopathology at the transition to adulthood

Reuben, A., Arseneault, L., Beddows, A., et al. · JAMA Network Open, 4(4), e217508

Associations between adolescent cannabis use and young-adult functioning in three longitudinal twin studies

Schaefer, J. D., Hamdi, N. R., Malone, S., et al. · Proceedings of the National Academy of Sciences, 118(14), e2013180118

Polygenic score for smoking is associated with externalizing psychopathology and disinhibited personality traits but not internalizing psychopathology in adolescence

Hicks, B. M., Clark, D. A., Deak, J. D., et al. · Clinical Psychological Science, 9(6), 1205–1213

Enduring mental health: The high lifetime prevalence of psychiatric disorder and emerging science of persistent mental wellness

Schaefer, J. D. · Journal of the American Academy of Child and Adolescent Psychiatry, 60(8), 955–957

Difficulties with emotion regulation as a transdiagnostic mechanism linking child maltreatment with the emergence of psychopathology

Weissman, D. G., Bitran, D., Miller, A. B., et al. · Development and Psychopathology, 31(3), 899–915

Association of childhood lead exposure with adult personality traits and lifelong mental health

Reuben, A., Schaefer, J. D., Moffitt, T. E., et al. · JAMA Psychiatry, 76(4), 418–425

Use of hierarchical measures of psychopathology to capture the long (and wide) shadow of early deprivation in the Bucharest Early Intervention Project analysis

Schaefer, J. D. · JAMA Psychiatry, 75(11), 1101–1102

Adolescent victimization and early-adult psychopathology: Approaching causal inference using a longitudinal twin study to rule out noncausal explanations

Schaefer, J. D., Moffitt, T. E., Arseneault, L., et al. · Clinical Psychological Science, 6(3), 352–371

Eleven telomere, epigenetic clock, and biomarker-composite quantifications of biological aging: Do they measure the same thing?

Belsky, D. W., Moffitt, T. E., Cohen, A. A., et al. · American Journal of Epidemiology, 187(6), 1220–1230

Is low cognitive functioning a predictor or consequence of major depressive disorder? A test in two longitudinal birth cohorts

Schaefer, J. D., Scult, M. A., Caspi, A., et al. · Development and Psychopathology, 1–15

Enduring mental health: Prevalence and prediction

Schaefer, J. D., Caspi, A., Belsky, D. W., et al. · Journal of Abnormal Psychology, 126(2), 212–224

Quantification of biological aging in young adults

Belsky, D. W., Caspi, A., Houts, R., et al. · Proceedings of the National Academy of Sciences, 112(30), E4104–E4110

Early-life intelligence predicts midlife biological age

Schaefer, J. D., Caspi, A., Belsky, D., et al. · The Journals of Gerontology: Psychological Sciences, 1–8

The global cognitive impairment in schizophrenia: Consistent over decades and around the world

Schaefer, J., Giangrande, E., Weinberger, D. R., Dickinson, D. · Schizophrenia Research, 150(1), 42–50

Does cannabis use increase risk of psychotic disorders? A critical examination of causality and differential vulnerability

Sloan, A., Schaefer, J. D. · In H. Marusak (Ed.), Cannabis and the Developing Brain. Springer Nature

Cannabis effects on brain and behavior: The problem of residual confounding and utility of twin studies

Lanigan, J., Yee, S., Schaefer, J. D. · In H. Marusak (Ed.), Cannabis and the Developing Brain. Springer Nature

The multi-faceted 'global' cognitive impairment profile in schizophrenia

Dickinson, D., Schaefer, J., Weinberger, D. R. · In P. D. Harvey (Ed.), Cognitive Impairment in Schizophrenia: Characteristics, Assessment, and Treatment. Cambridge University Press