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 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
    Using Longitudinal Research to Engage African American and Latinx Sexual- and Gender-Minority Youth in the HIV Prevention and Care Continua and Reduce HIV/AIDS-Related Disparities
    NIH U01DA036926Aug 15, 2015 - Jun 30, 2025
    Role: Co-Investigator
    The Impact of Early Medical Treatment in Transgender Youth
    NIH R01HD082554Aug 1, 2015 - Jan 31, 2026
    Role: Co-Investigator

    Collapse ORNG Applications 
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    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. to make corrections and additions.
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    Altmetrics Details PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. Brief Report: Accuracy in Self-Report of Viral Suppression Among HIV-Positive Men With HIV-Negative Male Partners. J Acquir Immune Defic Syndr. 2020 03 01; 83(3):210-214. Stephenson R, Bratcher A, Mimiaga MJ, Garofalo R, Hidalgo MA, Hoehnle S, Sullivan PS. PMID: 31917748.
      View in: PubMed   Mentions: 4     Fields:    Translation:HumansPHPublic Health
    2. Creating the Trans Youth Research Network: A collaborative research endeavor. Transgender Health. 2019; 1(4). Olson-Kennedy J, Chan Y, Rosenthal S, Hidalgo MA, Chen D, Clark L, Ehrensaft D, Garofalo R.
    3. Creating the Trans Youth Research Network: A Collaborative Research Endeavor. Transgend Health. 2019; 4(1):304-312. Olson-Kennedy J, Chan YM, Rosenthal S, Hidalgo MA, Chen D, Clark L, Ehrensaft D, Tishelman A, Garofalo R. PMID: 31701011.
      View in: PubMed   Mentions:
    4. Psychological functioning, parenting stress, and parental support among clinic-referred prepubertal gender-expansive children. Clinical Practice in Pediatric Psychology. 2019; 3(7):254-266. Kolbuck VD, Muldoon AL, Rychlik K, Hidalgo MA, Chen D.
    5. The Gender Minority Stress and Resilience Measure: Psychometric validity of an adolescent extension. Clinical Practice in Pediatric Psychology. 2019; 3(7):278-290. Hidalgo MA Petras H Chen D Chodzen G. .
    6. 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. Olson-Kennedy J, Chan YM, Garofalo R, Spack N, Chen D, Clark L, Ehrensaft D, Hidalgo M, Tishelman A, Rosenthal S. PMID: 31290407.
      View in: PubMed   Mentions:
    7. 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. Ignacio M, Garofalo R, Pearson C, Kuhns LM, Bruce J, Scott Batey D, Radix A, Belkind U, Hidalgo MA, Hirshfield S, Schnall R. PMID: 31294422.
      View in: PubMed   Mentions:
    8. Do Male Couples Agree on Their Sexual Agreements? An Analysis of Dyadic Data. Arch Sex Behav. 2019 05; 48(4):1203-1216. Sharma A, Garofalo R, Hidalgo MA, Hoehnle S, Mimiaga MJ, Brown E, Thai J, Bratcher A, Wimbly T, Sullivan PS, Stephenson R. PMID: 30895490.
      View in: PubMed   Mentions: 5     Fields:    Translation:Humans
    9. 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. 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. PMID: 30806868.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    10. Concordance in Reported Love, Trust, and Relationship Quality among Same-Sex Male Relationships. J Relatsh Res. 2018; 9. Bratcher A, Kahle E, Sullivan P, Hidalgo MA, Mimiaga MJ, Garofalo R, Pardee D, Hoehnle S, Thai J, Dana R, Stephenson R. PMID: 31447951.
      View in: PubMed   Mentions:
    11. 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. Hidalgo MA Chen D. .
    12. Minority stress factors associated with depression and anxiety among transgender and gender-nonconforming youth. Journal of Adolescent Health. 2019; 4(64):467-471. G Chodzen MA Hidalgo D Chen R Garofalo. .
    13. 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. 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. PMID: 30966769.
      View in: PubMed   Mentions: 5     Fields:    Translation:Humans
    14. Minority Stress Factors Associated With Depression and Anxiety Among Transgender and Gender-Nonconforming Youth. J Adolesc Health. 2019 04; 64(4):467-471. Chodzen G, Hidalgo MA, Chen D, Garofalo R. PMID: 30241721.
      View in: PubMed   Mentions: 17     Fields:    Translation:Humans
    15. 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. Garthe RC, Hidalgo MA, Hereth J, Garofalo R, Reisner SL, Mimiaga MJ, Kuhns L. PMID: 30059268.
      View in: PubMed   Mentions: 7     Fields:    Translation:Humans
    16. 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. Hidalgo MA Suarez NA Garofalo R Hoehnle S Thai J Mimiaga MJ Brown E Sullivan P Bratcher A Wimbly T Stephenson R. .
    17. Dyadic Reporting of Intimate Partner Violence Among Male Couples in Three U.S. Cities. Am J Mens Health. 2018 07; 12(4):1039-1047. Suarez NA, Mimiaga MJ, Garofalo R, Brown E, Bratcher AM, Wimbly T, Hidalgo MA, Hoehnle S, Thai J, Kahle E, Sullivan PS, Stephenson R. PMID: 29749299.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    18. Dyadic reporting of intimate partner violence among male couples in three US cities. American Journal of Men's Health. 2018; 12(4):1039. Suarez NA Mimiaga MJ Garofalo R Brown E Bratcher A Wimbly T Hidalgo MA Hoehnle S Thai J Kahle E Sullivan PS Stephenson R. .
    19. 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. 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. .
    20. Development of MyPEEPS Mobile: A behavioral health intervention for young men. Studies in Health Technology and Informatics. 2018; 250:31. Schnall R Kuhns L Hidalgo MA Hirschfield S Pearson C Radix A Belkind U Bruce J Batey DS Garofalo R. .
    21. Prevalence and risk correlates of intimate partner violence among a multi-site cohort of young transgender women. LGBT Health. 2018; 6(5):333-340. RC Garthe MA Hidalgo J Hereth R Garofalo SL Reisner MJ Mimiaga L Kuhns. .
    22. 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. Hidalgo MA. .
    23. Perceived Parental Attitudes of Gender Expansiveness: Development and Preliminary Factor Structure of a Self-Report Youth Questionnaire. Transgend Health. 2017; 2(1):180-187. Hidalgo MA, Chen D, Garofalo R, Forbes C. PMID: 29159312.
      View in: PubMed   Mentions:
    24. 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. Stephenson R, Suarez NA, Garofalo R, Hidalgo MA, Hoehnle S, Thai J, Mimiaga MJ, Brown E, Bratcher A, Wimbly T, Sullivan P. PMID: 28860107.
      View in: PubMed   Mentions:
    25. Parental Responses to Childrens’ Gender-Nonconforming Behavior. Perspectives on Early Childhood Psychology and Education. 2017; 2(2). Kolbruck VD, Chen D, Hidalgo MA, Chodzen G, Garofalo R.
    26. 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. Bazzi AR, Fergus KB, Stephenson R, Finneran CA, Coffey-Esquivel J, Hidalgo MA, Hoehnle S, Sullivan PS, Garofalo R, Mimiaga MJ. PMID: 27562905.
      View in: PubMed   Mentions:
    27. Multidisciplinary Care for Gender-Diverse Youth: A Narrative Review and Unique Model of Gender-Affirming Care. Transgend Health. 2016; 1(1):117-123. Chen D, Hidalgo MA, Leibowitz S, Leininger J, Simons L, Finlayson C, Garofalo R. PMID: 28861529.
      View in: PubMed   Mentions:
    28. "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. Bird JD, LaSala MC, Hidalgo MA, Kuhns LM, Garofalo R. PMID: 27092441.
      View in: PubMed   Mentions: 6     Fields:    Translation:Humans
    29. 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. Hidalgo MA, Kuhns LM, Kwon S, Mustanski B, Garofalo R. PMID: 26002599.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    30. Dulcan's Textbook of Child and Adolescent Psychiatry (Ed. M Dulcan). Gender Dysphoria and Nonconformity. 2015; 585-602. Leibowitz S, Chen D, Hidalgo MA. .
    31. 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. Hidalgo MA, Kuhns LM, Hotton AL, Johnson AK, Mustanski B, Garofalo R. PMID: 25135064.
      View in: PubMed   Mentions: 18     Fields:    Translation:Humans
    32. Impact of religiosity on the sexual risk behaviors of young men who have sex with men. J Sex Res. 2015; 52(5):590-8. Garofalo R, Kuhns LM, Hidalgo M, Gayles T, Kwon S, Muldoon AL, Mustanski B. PMID: 25072796.
      View in: PubMed   Mentions: 6     Fields:    Translation:Humans
    33. Understanding gender variance in children and adolescents. Pediatr Ann. 2014 Jun; 43(6):e126-31. Simons LK, Leibowitz SF, Hidalgo MA. PMID: 24972420.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    34. The gender affirmative model: What we know and what we aim to learn. Human Development. 2013; 56(5):285-90. Hidalgo MA, Ehrensaft D, Tishelman AC, Clark LF, Garofalo R, Rosenthal SM, Spack NP, Olson J.
    35. Negotiating dominant masculinity ideology: strategies used by gay, bisexual and questioning male adolescents. Am J Community Psychol. 2010 Mar; 45(1-2):169-85. Wilson BD, Harper GW, Hidalgo MA, Jamil OB, Torres RS, Fernandez MI, Adolescent Medicine Trials Network for HIV/AIDS Interventions . PMID: 20082238.
      View in: PubMed   Mentions: 12     Fields:    Translation:Humans
    36. 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. Oden K, Hernandez B, Hidalgo MA. PMID: 20668640.
      View in: PubMed   Mentions:
    37. 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. Warren JC, Fernández MI, Harper GW, Hidalgo MA, Jamil OB, Torres RS. PMID: 17721725.
      View in: PubMed   Mentions: 37     Fields:    Translation:Humans
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