
Institute for Behavioral Genetics
University of Colorado Boulder
447 UCB
Boulder, CO 80309-0447
Research Interests:
The use of cross-sectional and longitudinal studies of twins and families to study behavioral development, and genetic and environmental influences on behavior, personality, and health. Recent research focus on the development of behavior problems in childhood and adolescence, vulnerability to drug use, abuse, and dependence, genetics and health, and linkage and association studies of behavioral traits. Dr. Hewitt is the Editor-in-Chief of the journal, Behavior Genetics. He was Director of the Institute for Behavioral Genetics from 2001-2022.
Active Grants:
- R01 DA054087 (mPIs Rhee, Hewitt, Vrieze, Wilson) 05/01/22-02/28/27 Understanding the links between parental and adolescent substance use: complementary natural experiments using the children of twins design. Role: mPI
- U01 DA051018 (mPIs Banich, Friedman, Hewitt (until 07/0522)) 04/15/20-03/31/27 14/21 ABCD-USA consortium: research project site at CU Boulder. Role: mPI until 07/05/22, currently co-Investigator
- R01 DA042755-03 (mPIs Hopfer, Hewitt, Vrieze, McGue) 09/01/17-05/31/23 Impact of marijuana legalization: comparison of two longitudinal twin cohorts. Subcontract to Institute for Behavioral Genetics (Hewitt). Role:mPI
- R01 AG046938-05 (Reynolds) 06/01/15-05/31/26 Colorado Adoption/Twin Study of Lifespan Behavioral Development & Cognitive Aging Subcontract to Institute for Behavioral Genetics (Wadsworth). Role: co-I
- T32 MH016880-38 (Hewitt) 07/01/20-06/30/25 Research Training in Mental Health Behavior Genetics. Role: PI
- R25 MH019918-27 (Keller, previously Hewitt through 05-2021) 07/01/18-06/30/23 Workshop on Statistical Genetic Methods for Human Complex Traits. Role: co-I
- NIDA R01 DA054087 (Rhee (contact PI), Hewitt, Vrieze, Wilson) 5/1/2022 – 4/30/2027. Understanding the links between parental and adolescent substance use: complementary natural experiments using the children of twins design. Role: mPI (till 02-28-23) then co-I
Additional Information:
Former Trainees
Chelsie Benca
Doctoral student
2011-2013
Bo Bishop
Postdoctoral trainee
1998-2001
Angela Brant
Doctoral student
2007-2012
Michael F. Collins
Doctoral trainee
1980-1983
Teresa deCandia
Doctoral student
2009-2012
Sam Dozani
Doctoral student
2014-2017
Lynn Gynther
Doctoral student
1992-1994
Brett Haberstick
Doctoral student 2002-2005
Steve Hallett
Doctoral Trainee
1983-1987
Jeff Lessem
Doctoral student
1993-1999
Rohan Palmer
Doctoral student
2005-2010
Katie Paulich
Doctoral student
2019-2022
Christian Hopfer
K award trainee
1999-2004
Kristin Rasmus
Doctoral student
2014-2016
Chandra Reynolds
Postdoctoral trainee
1994
Soo Rhee
Postdoctoral trainee
1999-2001
K award trainee
2001-2006
Jane Sims
Doctoral Trainee
1984-1988
Elise Eller
Postdoctoral trainee
2001-2002
Naomi Friedman
Postdoctoral trainee
2002-2005
Michael Stallings
Postdoctoral trainee
1993-1994
David Timberlake
Postdoctoral trainee
2003-2006
Tari Topolski
Doctoral student
1993-1997
Tanya Button
Postdoctoral trainee
2005-2006
Carol van Hulle
Doctoral student
1996-2001
Marianne Wamboldt
K award trainee
1997-2002
Steve Wilson
Doctoral student
1993-2002
J Megan Ross
Postdoctoral trainee
2017-2020
Susan Young
K award trainee
2001-2006
Marissa Ehringer
K award trainee
2005-2010
Joe Sakai
K award trainee
2005-2010
Jason Boardman
K award trainee
2005-2010
Matthew Keller
K award trainee
2010-2014
Conclusion
Type: Chapter
Genetic and Environmental Variation in Continuous Phenotypes in the ABCD Study®
Maes HHM; Lapato DM; Schmitt JE; Luciana M; Banich MT; Bjork JM; Hewitt JK; Madden PA; Heath AC; Barch DM...
- Maes HHM
- Lapato DM
- Schmitt JE
- Luciana M
- Banich MT
- Bjork JM
- Hewitt JK
- Madden PA
- Heath AC
- Barch DM
Publication Date: 2023-02-01
Type: Journal Article
Impacts of recreational cannabis legalization on cannabis use: a longitudinal discordant twin study
Zellers SM; Ross JM; Saunders GRB; Ellingson JM; Anderson JE; Corley RP; Iacono W; Hewitt JK; Hopfer CJ; McGue MK...
- Zellers SM
- Ross JM
- Saunders GRB
- Ellingson JM
- Anderson JE
- Corley RP
- Iacono W
- Hewitt JK
- Hopfer CJ
- McGue MK
Publication Date: 2023-01-01
Type: Journal Article
Genetic diversity fuels gene discovery for tobacco and alcohol use
Publication Date: 2022-12-22
Type: Journal Article
Genetic Associations Between Executive Functions and Intelligence: A Combined Twin and Adoption Study
Publication Date: 2022-08-01
Type: Journal Article
Genome-wide Association Meta-analysis of Childhood and Adolescent Internalizing Symptoms
Jami ES; Hammerschlag AR; Ip HF; Allegrini AG; Benyamin B; Border R; Diemer EW; Jiang C; Karhunen V; Lu Y...
- Jami ES
- Hammerschlag AR
- Ip HF
- Allegrini AG
- Benyamin B
- Border R
- Diemer EW
- Jiang C
- Karhunen V
- Lu Y
Publication Date: 2022-06-27
Type: Journal Article
Psychiatric and Psychosocial Effects of Recreational Cannabis Legalization in Adulthood
Zellers SM; Ross JM; Saunders GRB; Ellingson JM; Anderson JE; Corley RP; Hewitt JK; Hopfer CJ; Iacono W; Mcgue MK...
- Zellers SM
- Ross JM
- Saunders GRB
- Ellingson JM
- Anderson JE
- Corley RP
- Hewitt JK
- Hopfer CJ
- Iacono W
- Mcgue MK
Publication Date: 2022-06-22
Type: Conference Proceeding
Exploring Relationships Between Internalizing Problems and Risky Sexual Behavior: A Twin Study
Publication Date: 2022-06-22
Type: Conference Proceeding
Anxiety-specific associations with substance use: Evidence of a protective factor in adolescence and a risk factor in adulthood
Publication Date: 2022-05-02
Type: Journal Article
Within-sibship genome-wide association analyses decrease bias in estimates of direct genetic effects
Howe LJ; Nivard MG; Morris TT; Hansen AF; Rasheed H; Cho Y; Chittoor G; Ahlskog R; Lind PA; Palviainen T...
- Howe LJ
- Nivard MG
- Morris TT
- Hansen AF
- Rasheed H
- Cho Y
- Chittoor G
- Ahlskog R
- Lind PA
- Palviainen T
Publication Date: 2022-05-01
Type: Journal Article
Executive Functions and Impulsivity as Transdiagnostic Correlates of Psychopathology in Childhood: A Behavioral Genetic Analysis
Publication Date: 2022-03-25
Type: Journal Article
The Emotional Word-Emotional Face Stroop task in the ABCD study: Psychometric validation and associations with measures of cognition and psychopathology
Smolker HR; Wang K; Luciana M; Bjork JM; Gonzalez R; Barch DM; McGlade EC; Kaiser RH; Friedman NP; Hewitt JK...
- Smolker HR
- Wang K
- Luciana M
- Bjork JM
- Gonzalez R
- Barch DM
- McGlade EC
- Kaiser RH
- Friedman NP
- Hewitt JK
Publication Date: 2022-02-01
Type: Journal Article
Genetic and environmental influences on executive functions and intelligence in middle childhood
Publication Date: 2022-01-01
Type: Journal Article
The effects of cannabis use on physical health: A co-twin control study
Ross JM; Ellingson JM; Frieser MJ; Corley RC; Hopfer CJ; Stallings MC; Wadsworth SJ; Reynolds CA; Hewitt JK...
- Ross JM
- Ellingson JM
- Frieser MJ
- Corley RC
- Hopfer CJ
- Stallings MC
- Wadsworth SJ
- Reynolds CA
- Hewitt JK
Publication Date: 2022-01-01
Type: Journal Article
Exploring Relationships Between Internalizing Problems and Risky Sexual Behavior: A Twin Study
Publication Date: 2021-11-01
Type: Conference Proceeding
Impacts of Recreational Cannabis Legalization on Cannabis Use and Other Drug Outcomes: A Longitudinal Discordant Twin Study
Publication Date: 2021-11-01
Type: Conference Proceeding
A Protective Role of Internalizing Symptoms in Adolescent Substance Use: Popularity and Harm Avoidance as Potential Mediators
Publication Date: 2021-11-01
Type: Conference Proceeding
Sex Differences in the Biometrical Model for Substance Use Vulnerability
Publication Date: 2021-11-01
Type: Conference Proceeding
Musical Instrument Engagement in Adolescence Predicts Verbal Ability 4 Years Later: A Twin and Adoption Study
Publication Date: 2021-11-01
Type: Journal Article
Screen time and early adolescent mental health, academic, and social outcomes in 9-and 10-year old children: Utilizing the Adolescent Brain Cognitive Development (SM) (ABCD) Study
Publication Date: 2021-09-08
Type: Journal Article
Children's Knowledge of Cannabis and Other Substances in States with Different Cannabis Use Regulations
Publication Date: 2021-08-24
Type: Journal Article
Substance use patterns in 9-10 year olds: Baseline findings from the adolescent brain cognitive development (ABCD) study
Lisdahl KM; Tapert S; Sher KJ; Gonzalez R; Nixon SJ; Ewing SWF; Conway KP; Wallace A; Sullivan R; Hatcher K...
- Lisdahl KM
- Tapert S
- Sher KJ
- Gonzalez R
- Nixon SJ
- Ewing SWF
- Conway KP
- Wallace A
- Sullivan R
- Hatcher K
Publication Date: 2021-08-12
Type: Journal Article
Baseline brain function in the preadolescents of the ABCD Study
Chaarani B; Hahn S; Allgaier N; Adise S; Owens MM; Juliano AC; Yuan DK; Loso H; Ivanciu A; Albaugh MD...
- Chaarani B
- Hahn S
- Allgaier N
- Adise S
- Owens MM
- Juliano AC
- Yuan DK
- Loso H
- Ivanciu A
- Albaugh MD
Publication Date: 2021-06-07
Type: Journal Article
Genetic and environmental relations of executive functions to antisocial personality disorder symptoms and psychopathy
Publication Date: 2021-04-21
Type: Journal Article
Familial factors may not explain the effect of moderate-to-heavy cannabis use on cognitive functioning in adolescents: a sibling-comparison study
Ellingson JM; Ross JM; Winiger E; Stallings MC; Corley RP; Friedman NP; Hewitt JK; Tapert SF; Brown SA; Wall TL...
- Ellingson JM
- Ross JM
- Winiger E
- Stallings MC
- Corley RP
- Friedman NP
- Hewitt JK
- Tapert SF
- Brown SA
- Wall TL
Publication Date: 2021-04-01
Type: Journal Article
Pages
Recruiting
Dr. Hewitt is not currently recruiting graduate students or postdocs.