Marco A. Hidalgo, PhD, MA
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Marco A. Hidalgo, PhD, MA

  • Pediatric Psychology|
  • Clinical Psychology
Santa Monica 16th Street Internal Medicine & Pediatrics | 1245 16th Street, Suite 204, Santa Monica, CA 90404


Marco A. Hidalgo, PhD, has an academic appointment as Associate Clinical Professor of Medicine at UCLA's David Geffen School of Medicine, and a faculty appointment within Internal Medicine-Pediatrics at UCLA Health. He is a licensed clinical psychologist with extensive training in the assessment and treatment of gender dysphoria, substance use, anxiety-, mood- and trauma-related conditions among children, adolescents and adults. Dr. Hidalgo provides short-term, evidence-based assessment and psychotherapy services exclusively to patients of the Gender Health Program, ranging from children to adults.





PhD, DePaul University, 2011




Dr. Hidalgo, an NIH-sponsored investigator, focuses research on a breadth of areas pertaining to sexual and gender minority (SGM) individuals across the lifespan: mental health, psychometrics, minority stress and resilience, transgender health, and HIV prevention intervention.

Dr. Hidalgo is Principal Investigator of Gender Journey Project, a five-year study examining gender development and mental health among a national sample of prepubertal transgender/non-binary and gender-diverse children.


Noteworthy publications include:

  1. 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. 56(5):285-90, 2013.
  2. Hidalgo MA, Kuhns LM, L. HA, 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. Archives of Sexual Behavior. 44(2):475-85, 2014. PMID: 25135064, PMCID: PMC4559339
  3. 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 & Neglect. 46:103-12, 2015. PMID: 26002599, PMCID: 4527874
  4. 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. Transgender Health. 2(1), 180-187; 2017. PMID: 29159312, PMCID: PMC5685204
  5. Hidalgo MA, Suarez N, 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 and Lesbian Mental Health. 22(4); 327-347; 2018. PMID/PMC not yet assigned.
  6. 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. 40(7): 865-886, 2019. PMID: 33911325. PMCID: PMC8078838.
  7. 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. 7 (3):278-290, 2019. PMID: 33224698. PMCID: PMC7678225
  8. Hidalgo MA, Layland E, Kubicek K, Kipke M. Sexual racism, psychological symptoms, and mindfulness among ethnically/racially-diverse young men who have sex with men: A moderation analysis. Mindfulness. 2019; 11(2):452-461. PMID: 35082927. PMCID: PMC8789003
  9. Chen D, Abrams M, Clark L, Ehrensaft D, Tishelman AC, Chan YM, Garofalo R, Olson-Kennedy J, Rosenthal SM, Hidalgo MA. Psychosocial Characteristics of Transgender Youth Seeking Gender-Affirming Medical Treatment: Baseline Findings From the Trans Youth Care Study. J Adolesc Health. 2020:S1054-139X(20)30453-5. PMID: 32839079, PMCID: Not yet assigned
  10. Gordián-Arroyo A, Schnall R, Garofalo R, Kuhns LM, Pearson C, Bruce J, Batey DS, Radix A, Belkind U, Hirshfield S, Hidalgo MA. Homonegative Victimization and Perceived Stress among Adolescent Sexual Minority Males: The Attenuating Role of Peer and Family Support. International Journal of Sexual Health. 2022 Sep 23; published online. PMID: 36776753. PMCID: PMC9918044.
  11. Chen D, Berona J, Chan YM, Ehrensaft D, Garofalo R, Hidalgo MA, Rosenthal SM, Tishelman AC, & Olson-Kennedy J. Psychosocial functioning in transgender youth after 2 years of hormones. New England Journal of Medicine 2023; 388; 240-250. PMID: 36652355. PMCID: PMC10081536.
  12. Conn BM, Chen D, Olson-Kennedy J, Chan YM, Ehrensaft D, Garofalo R, Rosenthal SM, Tishelman A, Hidalgo MA. High internalized transphobia and low gender identity pride are associated with depression symptoms among transgender and gender-diverse youth. Journal of Adolescent Health 2023 Jun; 72(6): 877-884. PMID: 37045610. PMCID: PMC10243649.


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