Marco Armando Hidalgo, PhD

Title(s)Assistant Professor of Clinical Pediatrics
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    Collapse Biography 
    Collapse Education and Training
    Universiteit van Amsterdam, Amsterdam, NLCertificate07/2002Sexuality and gender studies
    San Francisco State University, San Francisco, CABA05/2004Psychology
    DePaul University, Chicago, ILMA06/2007Clinical psychology
    DePaul University, Chicago, ILPhD09/2011Clinical psychology
    Harvard Medical School/Cambridge Health Alliance, Boston, MAFellowship08/2012Trauma psychology
    Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, ILFellowship06/2013Clinical-child psychology (trauma, mood and anxiety)
    Collapse Awards and Honors
    Northwestern University Feinberg School of Medicine, Chicago, IL2017Recognition for Excellence in Teaching
    Society for Adolescent Health and Medicine (SAHM)2014Finalist, Robert H. DuRant Award for Statistical Rigor and Innovation in Adolescent Health Research

    Collapse Overview 
    Collapse Overview
    Marco A. Hidalgo, PhD, is a clinical-child and adolescent psychologist and Assistant Professor of Clinical Pediatrics at USC's Keck School of Medicine. As a faculty member in the Center for Transyouth Health and Development at Children's Hospital Los Angeles (CHLA), Dr. Hidalgo splits his time between conducting psychotherapy and research.

    Dr. Hidalgo joined the CHLA/USC faculty in 2018, after relocating from Lurie Children's Hospital/Northwestern University Feinberg School of Medicine. In 2013, while faculty at Lurie Children's, Dr. Hidalgo co-established the nationally-renowned Gender and Sex Development Program (GSDP)— the Midwest's largest pediatric subspecialty program for transgender/gender-expansive children, adolescents, young adults and their families. The GSDP was profiled on the acclaimed 2015 PBS' Frontline episode "Growing Up Trans."

    Dr. Hidalgo’s research focuses exclusively on sexual and gender minority individuals, primarily youth and young adults. His research examines clinical and psychosocial mechanisms that foster wellbeing, and his more applied research focuses on developing and evaluating various modalities of HIV prevention intervention (e.g., group-based and mHealth). He is currently Principal Investigator on a 5-year NIH study examining gender development and mental health among pre-pubescent transgender/gender-nonconforming children. Dr. Hidalgo is Co-Investigator on 5 additional NIH-funded studies, including a ground-breaking observational study investigating the impact of early medical treatment in transgender youth who seek care in Los Angeles, Boston, Chicago and San Francisco (PI: Johanna Olson-Kennedy).

    In his clinical work, Dr. Hidalgo’s practice is exclusively focused on children, adolescents and young adults (up to age 25) who are of gender minority experience (i.e., transgender, gender-expansive, gender non-binary). In individual and family therapy, he integrates evidence-based approaches to treat emotional and behavioral problems related to depression, anxiety, traumatic stress conditions, and gender dysphoria.

    Dr. Hidalgo teaches CHLA/USC trainees and fellows on topics relevant to adolescent behavioral health, implicit bias, LGBTQ health, and behavioral research. He has been recognized by Northwestern University's Feinberg School of Medicine for his excellence in teaching on topics related to child-adolescent gender and sexuality.

    Collapse Research 
    Collapse Research Activities and Funding
    A Longitudinal Study of Gender Nonconformity in Prepubescent Children
    NIH R01HD097122Mar 21, 2019 - Feb 29, 2024
    Role: Principal Investigator
    Mobile Adaptation and Testing of a Uniquely Targeted HIV Intervention for Young Transgender Women
    NIH R56MH113684Sep 21, 2018 - Sep 20, 2019
    Role: Co-Investigator
    Y2Prevent: Preventing Drug Use and HIV through Empowerment, Social Support and Mentorship
    NIH/NIDA R34DA044106Aug 15, 2018 - Jul 31, 2021
    Role: Co-Investigator
    A Pragmatic Clinical Trial of MyPEEPS Mobile to Improve HIV prevention Behaviors in Diverse Adolescent MSM
    NIH U01MD011279Sep 1, 2016 - Apr 30, 2021
    Role: Co-Investigator
    Young Men of Color Who Have Sex with Men Cohort Study
    NIH/NIDA U01DA036926Aug 15, 2015 - Jul 31, 2020
    Role: Co-Investigator
    The Impact of Early Medical Treatment in Transgender Youth
    NIH/NICHD R01HD082554Aug 1, 2015 - Jun 30, 2020
    Role: Co-Investigator

    Collapse ORNG Applications 
    Collapse Featured Publications
    Collapse Websites
    Collapse Required Scholarly Project Mentor

    Collapse Bibliographic 
    Collapse Publications
    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help.
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    1. Stephenson R, Bratcher A, Mimiaga MJ, Garofalo R, Hidalgo MA, Hoehnle S, Sullivan PS. Brief Report: Accuracy in Self-Report of Viral Suppression Among HIV-Positive Men With HIV-Negative Male Partners. J Acquir Immune Defic Syndr. 2020 Mar 01; 83(3):210-214. PMID: 31917748.
      View in: PubMed
    2. Olson-Kennedy J, Chan Y, Rosenthal S, Hidalgo MA, Chen D, Clark L, Ehrensaft D, Garofalo R.Creating the Trans Youth Research Network: A collaborative research endeavor. Transgender Health. 2019; 1(4).
    3. Olson-Kennedy J, Chan YM, Rosenthal S, Hidalgo MA, Chen D, Clark L, Ehrensaft D, Tishelman A, Garofalo R. Creating the Trans Youth Research Network: A Collaborative Research Endeavor. Transgend Health. 2019; 4(1):304-312. PMID: 31701011.
      View in: PubMed
    4. Kolbuck VD, Muldoon AL, Rychlik K, Hidalgo MA, Chen D.Psychological functioning, parenting stress, and parental support among clinic-referred prepubertal gender-expansive children. Clinical Practice in Pediatric Psychology. 2019; 3(7):254-266.
    5. Hidalgo MA Petras H Chen D Chodzen G.. The Gender Minority Stress and Resilience Measure: Psychometric validity of an adolescent extension. Clinical Practice in Pediatric Psychology. 2019; 3(7):278-290.
    6. Olson-Kennedy J, Chan YM, Garofalo R, Spack N, Chen D, Clark L, Ehrensaft D, Hidalgo M, Tishelman A, Rosenthal S. Impact of Early Medical Treatment for Transgender Youth: Protocol for the Longitudinal, Observational Trans Youth Care Study. JMIR Res Protoc. 2019 Jul 09; 8(7):e14434. PMID: 31290407.
      View in: PubMed
    7. Ignacio M, Garofalo R, Pearson C, Kuhns LM, Bruce J, Scott Batey D, Radix A, Belkind U, Hidalgo MA, Hirshfield S, Schnall R. Pilot feasibility trial of the MyPEEPS mobile app to reduce sexual risk among young men in 4 cities. JAMIA Open. 2019 Jul; 2(2):272-279. PMID: 31294422.
      View in: PubMed
    8. Sharma A, Garofalo R, Hidalgo MA, Hoehnle S, Mimiaga MJ, Brown E, Thai J, Bratcher A, Wimbly T, Sullivan PS, Stephenson R. Do Male Couples Agree on Their Sexual Agreements? An Analysis of Dyadic Data. Arch Sex Behav. 2019 05; 48(4):1203-1216. PMID: 30895490.
      View in: PubMed
    9. Mimiaga MJ, Suarez N, Garofalo R, Frank J, Ogunbajo A, Brown E, Bratcher A, Pardee D, Hidalgo MA, Hoehnle S, Restar A, Wimbly T, Thai J, Sullivan PS, Stephenson R. Relationship Dynamics in the Context of Binge Drinking and Polydrug Use Among Same-Sex Male Couples in Atlanta, Boston, and Chicago. Arch Sex Behav. 2019 05; 48(4):1171-1184. PMID: 30806868.
      View in: PubMed
    10. Bratcher A, Kahle E, Sullivan P, Hidalgo MA, Mimiaga MJ, Garofalo R, Pardee D, Hoehnle S, Thai J, Dana R, Stephenson R. Concordance in Reported Love, Trust, and Relationship Quality among Same-Sex Male Relationships. J Relatsh Res. 2018; 9. PMID: 31447951.
      View in: PubMed
    11. Hidalgo MA Chen D.. Experiences of Gender Minority Stress in Cisgender Parents of Transgender/Gender-expansive Prepubertal Children: A Qualitative Study. Journal of Family Issues. 2019; 7(40):865-886.
    12. G Chodzen MA Hidalgo D Chen R Garofalo.. Minority stress factors associated with depression and anxiety among transgender and gender-nonconforming youth. Journal of Adolescent Health. 2019; 4(64):467-471.
    13. Schnall R, Kuhns LM, Hidalgo MA, Powell D, Thai J, Hirshfield S, Pearson C, Ignacio M, Bruce J, Batey DS, Radix A, Belkind U, Garofalo R. Adaptation of a Group-Based HIV RISK Reduction Intervention to a Mobile App for Young Sexual Minority Men. AIDS Educ Prev. 2018 12; 30(6):449-462. PMID: 30966769.
      View in: PubMed
    14. Chodzen G, Hidalgo MA, Chen D, Garofalo R. Minority Stress Factors Associated With Depression and Anxiety Among Transgender and Gender-Nonconforming Youth. J Adolesc Health. 2019 Apr; 64(4):467-471. PMID: 30241721.
      View in: PubMed
    15. Garthe RC, Hidalgo MA, Hereth J, Garofalo R, Reisner SL, Mimiaga MJ, Kuhns L. Prevalence and Risk Correlates of Intimate Partner Violence Among a Multisite Cohort of Young Transgender Women. LGBT Health. 2018 Aug/Sep; 5(6):333-340. PMID: 30059268.
      View in: PubMed
    16. Hidalgo MA Suarez NA Garofalo R Hoehnle S Thai J Mimiaga MJ Brown E Sullivan P Bratcher A Wimbly T Stephenson R.. Clinically significant depressive symptoms among a diverse sample of same-sex male couples in Atlanta, Boston, and Chicago: An analysis of individual- and dyadic-level factors. Journal of Gay & Lesbian Mental Health. 2018; 4(22):327-347.
    17. Suarez NA, Mimiaga MJ, Garofalo R, Brown E, Bratcher AM, Wimbly T, Hidalgo MA, Hoehnle S, Thai J, Kahle E, Sullivan PS, Stephenson R. Dyadic Reporting of Intimate Partner Violence Among Male Couples in Three U.S. Cities. Am J Mens Health. 2018 07; 12(4):1039-1047. PMID: 29749299.
      View in: PubMed
    18. Suarez NA Mimiaga MJ Garofalo R Brown E Bratcher A Wimbly T Hidalgo MA Hoehnle S Thai J Kahle E Sullivan PS Stephenson R.. Dyadic reporting of intimate partner violence among male couples in three US cities. American Journal of Men's Health. 2018; 12(4):1039.
    19. Marsack J Kahle E Suarez NA Mimiaga MJ Garofalo R Brown E Bratcher A Wimbly T Hidalgo MA Hoehnle S Thai J Sullivan PS Stephenson R.. Relationship characteristics and dyadic approaches to HIV health-enhancing behaviours among a sample of same-sex male couples from three US cities. Journal of Relationships Research. 2018; 9.
    20. Schnall R Kuhns L Hidalgo MA Hirschfield S Pearson C Radix A Belkind U Bruce J Batey DS Garofalo R.. Development of MyPEEPS Mobile: A behavioral health intervention for young men. Studies in Health Technology and Informatics. 2018; 250:31.
    21. RC Garthe MA Hidalgo J Hereth R Garofalo SL Reisner MJ Mimiaga L Kuhns.. Prevalence and risk correlates of intimate partner violence among a multi-site cohort of young transgender women. LGBT Health. 2018; 6(5):333-340.
    22. Hidalgo MA.. Affirmative Mental Health Care for Transgender and Gender Diverse Youth. Trauma stabilization and recovery in a transgender Latina: A retrospective case example. 2018; 145-156.
    23. Hidalgo MA, Chen D, Garofalo R, Forbes C. Perceived Parental Attitudes of Gender Expansiveness: Development and Preliminary Factor Structure of a Self-Report Youth Questionnaire. Transgend Health. 2017; 2(1):180-187. PMID: 29159312.
      View in: PubMed
    24. Stephenson R, Suarez NA, Garofalo R, Hidalgo MA, Hoehnle S, Thai J, Mimiaga MJ, Brown E, Bratcher A, Wimbly T, Sullivan P. Project Stronger Together: Protocol to Test a Dyadic Intervention to Improve Engagement in HIV Care Among Sero-Discordant Male Couples in Three US Cities. JMIR Res Protoc. 2017 Aug 31; 6(8):e170. PMID: 28860107.
      View in: PubMed
    25. Kolbruck VD, Chen D, Hidalgo MA, Chodzen G, Garofalo R.Parental Responses to Childrens’ Gender-Nonconforming Behavior. Perspectives on Early Childhood Psychology and Education. 2017; 2(2).
    26. Bazzi AR, Fergus KB, Stephenson R, Finneran CA, Coffey-Esquivel J, Hidalgo MA, Hoehnle S, Sullivan PS, Garofalo R, Mimiaga MJ. A Dyadic Behavioral Intervention to Optimize Same Sex Male Couples' Engagement Across the HIV Care Continuum: Development of and Protocol for an Innovative Couples-based Approach (Partner Steps). JMIR Res Protoc. 2016 Aug 25; 5(3):e168. PMID: 27562905.
      View in: PubMed
    27. Chen D, Hidalgo MA, Leibowitz S, Leininger J, Simons L, Finlayson C, Garofalo R. Multidisciplinary Care for Gender-Diverse Youth: A Narrative Review and Unique Model of Gender-Affirming Care. Transgend Health. 2016; 1(1):117-123. PMID: 28861529.
      View in: PubMed
    28. Bird JD, LaSala MC, Hidalgo MA, Kuhns LM, Garofalo R. "I Had to Go to the Streets to Get Love": Pathways From Parental Rejection to HIV Risk Among Young Gay and Bisexual Men. J Homosex. 2017; 64(3):321-342. PMID: 27092441.
      View in: PubMed
    29. Hidalgo MA, Kuhns LM, Kwon S, Mustanski B, Garofalo R. The impact of childhood gender expression on childhood sexual abuse and psychopathology among young men who have sex with men. Child Abuse Negl. 2015 Aug; 46:103-12. PMID: 26002599.
      View in: PubMed
    30. Leibowitz S, Chen D, Hidalgo MA.. Dulcan's Textbook of Child and Adolescent Psychiatry (Ed. M Dulcan). Gender Dysphoria and Nonconformity. 2015; 585-602.
    31. Hidalgo MA, Kuhns LM, Hotton AL, Johnson AK, Mustanski B, Garofalo R. The MyPEEPS randomized controlled trial: a pilot of preliminary efficacy, feasibility, and acceptability of a group-level, HIV risk reduction intervention for young men who have sex with men. Arch Sex Behav. 2015 Feb; 44(2):475-85. PMID: 25135064.
      View in: PubMed
    32. Garofalo R, Kuhns LM, Hidalgo M, Gayles T, Kwon S, Muldoon AL, Mustanski B. Impact of religiosity on the sexual risk behaviors of young men who have sex with men. J Sex Res. 2015; 52(5):590-8. PMID: 25072796.
      View in: PubMed
    33. Simons LK, Leibowitz SF, Hidalgo MA. Understanding gender variance in children and adolescents. Pediatr Ann. 2014 Jun; 43(6):e126-31. PMID: 24972420.
      View in: PubMed
    34. Hidalgo MA, Ehrensaft D, Tishelman AC, Clark LF, Garofalo R, Rosenthal SM, Spack NP, Olson J.The gender affirmative model: What we know and what we aim to learn. Human Development. 2013; 56(5):285-90.
    35. Wilson BD, Harper GW, Hidalgo MA, Jamil OB, Torres RS, Fernandez MI. Negotiating dominant masculinity ideology: strategies used by gay, bisexual and questioning male adolescents. Am J Community Psychol. 2010 Mar; 45(1-2):169-85. PMID: 20082238.
      View in: PubMed
    36. Oden K, Hernandez B, Hidalgo MA. Payoffs of Participatory Action Research: Racial and Ethnic Minorities with Disabilities Reflect on their Research Experiences. Community Dev (Columb). 2010 Jan; 41(1):21-31. PMID: 20668640.
      View in: PubMed
    37. Warren JC, Fernández MI, Harper GW, Hidalgo MA, Jamil OB, Torres RS. Predictors of unprotected sex among young sexually active African American, Hispanic, and White MSM: the importance of ethnicity and culture. AIDS Behav. 2008 May; 12(3):459-68. PMID: 17721725.
      View in: PubMed