Zellers, S., Alexander, J., Ellingson, J. M., Schaefer, J. D., Corley, R. P., Iacono, W., Hewitt, J. K., Hopfer, C. J., McGue, M. K., & Vrieze, S. (2024). Limited psychological and social effects of lifetime cannabis use frequency: Evidence from a 30-year community study of 4,078 twins. Journal of Psychopathology and Clinical Science, 133(1), 115–128. doi: 10.1037/abn0000867

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Padrutt, E. R., Harper, J., Schaefer, J. D., Nelson, K. M., McGue, M., Iacono, W. G., & Wilson, S. (2023). Pubertal timing and adolescent outcomes: Investigating explanations for associations with a genetically informed design. Journal of Child Psychology and Psychiatry, 64(8), 1232–1241. doi:10.1111/jcpp.13808

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Schaefer, J.D., Nelson, K., Wilson, S. (2023) The effects of adolescent cannabis use on psychosocial functioning: A critical review of the evidence. Child and Adolescent Psychiatric Clinics of North America, 32(6), 43-55. doi: 10.1016/j.chc.2022.06.003

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Schaefer, J.D., Cheng, T., Dunn, E.C. (2022). Sensitive periods in development and risk for psychiatric disorders and related endpoints: a systematic review of child maltreatment findings. The Lancet Psychiatry, 9(12), 978-991. doi: 10.1016/S2215-0366(22)00362-5

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Deak, J., Clark, D., Liu, M., Schaefer, J.D., Jang, S., Durbin, C., Iacono, W., McGue, M., Vrieze, S., Hicks, B. (2022). Alcohol and nicotine polygenic scores are associated with the development of alcohol and nicotine use problems from adolescence through young adulthood. Addiction, 117, 1117-1127. doi: 10.1111/add.15697

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Assari, S. & Schaefer, J.D. (2021) Parental educational attainment and frequency of marijuana use in youth: Hispanics’ diminished returns. Journal of Educational and Cultural Studies, 5(6), 47- 60.

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Schaefer, J.D., Jang, S., Clark, D.A., Deak, J.D., Hicks, B.M., Iacono, W.G., Liu, M., McGue, M., Vrieze, S., Wilson, S. (2021) 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. Psychological Medicine, 1-11. doi:10.1017/S0033291721004116

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Polusny, M.A., Marquadt, C.A., Campbell, E.H., Filetti, C.R., Noel, V.V., Disner, S.G., Schaefer, J.D., Davenport, N., Lissek, S., Noorbaloochi, S., Sponheim, S.R., Erbes, C.R. (in press). Advancing Research on Mechanisms of Resilience (ARMOR) longitudinal cohort study of new military recruits: results from a feasibility pilot study. Research in Human Development, 18(3), 212-229. doi: 10.1080/15427609.2021.1964898

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Hicks, B.M., Clark, D.A., Deak, J.D., Schaefer, J.D., Liu, M., Jang, S., Durbin, C.E., Johnson, W., Wilson, S., Iacono, W.G., McGue, M., Vrieze, S.I. (2021). Polygenic scores for smoking and educational attainment have independent influences on academic success and adjustment in adolescence and educational attainment in adulthood. PLOS ONE, 16(8):e0255348. doi: 10.1371/journal.pone.0255348

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Schaefer, J.D., Jang, S., Vrieze, S., Iacono, W.G., McGue, M., Wilson, S. (2021). Adolescent cannabis use and adult psychoticism: A longitudinal co-twin control analysis using data from two cohorts. Journal of Abnormal Psychology, 130(7), 691-701. doi: 10.1037/abn0000701

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Reuben, A., Arseneault, L., Beddows, A., Beevers, S.D., Caspi, A., Moffitt, T.E., Ambler, A.P., Latham, R.M., Newbury, J.B., Odgers, C.L., Schaefer, J.D., Fisher, H.L. (2021). Air pollution exposure in childhood and adolescence and psychopathology at the transition to adulthood. JAMA Network Open, 4(4):e217508. doi:10.1001/jamanetworkopen.2021.7508

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Schaefer, J.D., Hamdi, N.R., Malone, S., Vrieze, S., Wilson, McGue, M., Iacono, W.G. (2021). Associations between adolescent cannabis use and young-adult functioning in three longitudinal twin studies. Proceedings of the National Academy of Sciences of the United States of America, 118(14), e2013180118. doi:10.1073/pnas.2013180118

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Hicks, B.M., Clark, D.A., Deak, J.D., Liu, M., Durbin, E., Schaefer, J.D., Wilson, S., Iacono, W.G., McGue, M., Vrieze, S.I. (2021). Polygenic score for smoking is associated with externalizing psychopathology and disinhibited personality traits but not internalizing psychopathology in adolescence. Clinical Psychological Science, 9(6), 1205-1213. doi: 10.1177/21677026211002117

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Schaefer, J.D. (2021) Enduring mental health: The high lifetime prevalence of psychiatric disorder and emerging science of persistent mental wellness. Journal of the American Academy of Child and Adolescent Psychiatry, 60(8), 955-957. doi: 10.1016/j.jaac.2021.01.004

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Weissman, D.G., Bitran, D., Miller, A.B., Schaefer, J.D., Sheridan, M.A., McLaughlin, K.A. (2019). Difficulties with emotion regulation as a transdiagnostic mechanism linking child maltreatment with the emergence of psychopathology. Development and Psychopathology, 31(3), 899-915. doi: 10.1017/S0954579419000348

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*Reuben, A., *Schaefer, J.D., Moffitt, T.E., Belsky, D.W., Broadbent, J., Harrington, H., Houts, R., Ramrakha, S., Poulton, R., Caspi, A. (2019). Association of childhood lead exposure with adult personality traits and lifelong mental health. JAMA Psychiatry, 76(4), 418-425. doi: 10.1001/jamapsychiatry.2018.4192

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Schaefer, J.D. (2018). Use of hierarchical measures of psychopathology to capture the long (and wide) shadow of early deprivation in the Bucharest Early Intervention Project analysis. JAMA Psychiatry, 75(11), 1101-1102. doi:10.1001/jamapsychiatry.2018.2215

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Schaefer, J.D., Moffitt, T.E., Arseneault, L., Danese, A., Fisher, H.L., Houts, R., Sheridan, M. A., Wertz, J., Caspi, A. (2018). Adolescent victimization and early-adult psychopathology: Approaching causal inference using a longitudinal twin study to rule out alternative non-causal explanations. Clinical Psychological Science, 6(3), 352-371. doi: 10.1177/2167702617741381

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Belsky, D.W., Moffitt, T.E., Cohen, A.A., Corcoran, D.L., Levine, M.E., Prinz, J., Schaefer, J.D., Sugden, K., Williams, B., Poulton, R., Caspi, A. (2018). Eleven telomere, epigenetic clock, and biomarker-composite quantifications of biological aging: Do they measure the same thing? American Journal of Epidemiology, 187(6), 1220-1230. doi: 10.1093/aje/kwx346

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*Schaefer, J.D., *Scult, M.A., Caspi, A., Belsky, D.W., Hariri, A.R., Harrington, M., Houts, R., Ramrakha, S. Poulton, R., Moffitt, T.E. (2017). Is low cognitive functioning a predictor or consequence of major depressive disorder? A test in two longitudinal birth cohorts. Development and Psychopathology, 1-15.                                  doi: 10.1017/S095457941700164X

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Schaefer, J.D., Caspi, A., Belsky, D.W., Harrington, H., Houts, R., Horwood, J., Hussong, A., Ramrakha, S., Poulton, R., Moffitt, T.E. (2017). Enduring mental health: prevalence and prediction. Journal of Abnormal Psychology, 126(2), 212-224. doi: 10.1037/abn0000232

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Belsky, D.W., Caspi, A., Houts, R., Cohen, H., Corcoran, D., Danese, A., Harrington, H., Israel, S., Levine, M., Schaefer, J. D., Sugden, K., Williams, B., Yashin, A., Poulton, R., Moffitt, T. E. (2015). Quantification of biological aging in young adults. Proceedings of the National Academy of Sciences, 112(30): E4104-10.

doi: 10.1073/pnas.1506264112

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Schaefer, J.D., Caspi, A., Belsky, D., Harrington, H., Houts, R., Israel, S., Levine, M., Sugden, K., Williams, B., Poulton, R., Moffitt, T. E. (2015). Early-life intelligence predicts midlife biological age. The Journal of Gerontology: Psychological Sciences, 1-8. doi: 10.1093/geronb/gbv035.

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Schaefer, J., Giangrande, E., Weinberger, D.R., Dickinson, D. (2013). The global cognitive impairment in schizophrenia: Consistent over decades and around the world. Schizophrenia Research, 150(1): 42-50. doi: 10.1016/j.schres.2013.07.009