Lurie Children’s Hospital of Chicago, where he specializes in treating mood, anxiety and stress-related conditions in lesbian, gay, bisexual and gender-diverse youth. Hidalgo conducts assessments, therapy and also staffs a bi-monthly multidisciplinary clinic dedicated to gender-diverse youth and their families. His research examines health behavior, mental health and gender identity development in LGB and gender-diverse youth as well as HIV–affected youth.