Clinical & Behavioral Health Specialists

Mary Fournier, MD | Pediatrician
Mary E. Fournier, MD, MPH is the clinical practice director for the Division of Adolescent Medicine. She is board-certified in Pediatrics and Adolescent Medicine. She is Instructor of Pediatrics at Northwestern University Feinberg School of Medicine. Her clinical interests include adolescent gynecology, risk behaviors and primary care.

Lisa Simons, MD | Attending Physician
Dr. Simons is an attending physician at Lurie Children’s Division of Adolescent and Young Adult Medicine and an Instructor of Pediatrics at the Feinberg School. She is board-certified in pediatrics and completed her pediatric residency at Johns Hopkins Children’s Center. Dr. Simons completed her fellowship in Adolescent Medicine at Children’s Hospital of Los Angeles, where she trained at the Center for Transyouth Health and Development, one of the country’s largest clinics providing care for gender non-conforming and transgender youth. Dr. Simons provides direct clinical care as a physician in the Gender and Sex Development program.

Marco Hidalgo, PhD | Psychologist
Dr. Hidalgo is a medical psychologist in the Division of Adolescent Medicine and Assistant Professor of Psychiatry and Behavioral Sciences at Northwestern University Feinberg School of Medicine. Dr. Hidalgo regularly staffs the multi-disciplinary Gender Development Clinic, and occasional staffs a clinic for youth with disorders of sex differences. His research examines health behavior, mental health, HIV prevention, and gender identity development in LGBT individuals. Dr. Hidalgo received his PhD (2011) and MA (2007) from DePaul University, his BA (2004) from San Francisco State University and he completed post-doctoral clinical training at Cambridge Health Alliance/Harvard Medical School (2012) and at Lurie Children's (2014).

Diane Chen, PhD | Pediatric Psychologist
Diane Chen, PhD, is a medical psychologist in the Division of Adolescent Medicine and Assistant Professor of Psychiatry and Behavioral Sciences at Northwestern University Feinberg School of Medicine. She specializes in treating mood, anxiety and behavioral disorders using evidence-based individual, group and family psychotherapeutic approaches with gender- and sex-diverse youth. Dr. Chen regularly staffs the multidisciplinary Gender Development Clinic for transgender and gender-diverse youth and the Sex Development Clinic for youth with differences in sex development. She is actively involved in the clinical and academic endeavors of the Pediatric/Adolescent Gender and Sex Diversity Fertility Working Group. Her research examines health behavior, mental health, gender identity development and clinical decision-making among gender - and sex-diverse children, adolescents, and youth adults and their families.

Dr. Chen received her PhD (2012) and MA (2008) from Temple University, her BA (2004) from the University of Michigan, and completed her internship (2012) and post-doctoral training (2013) in clinical child and pediatric psychology at Lurie Children’s.

Najah Senno Musacchio, MD | Pediatrician
Dr. Musacchio is an attending physician in the Division of Adolescent Medicine at Lurie Children’s Hospital and is an Assistant Professor of Pediatrics at Northwestern University Feinberg School of Medicine. She is board-certified in Pediatrics. She attended Northwestern University (BA) and Rush Medical College (MD). She completed her pediatrics residency and fellowship in General Academic Pediatrics at Children’s Memorial Hospital. Her clinical interests include adolescent mental health care, including ADHD, anxiety, and depression, and concerns about bullying, self-esteem, and stress management.

Jennifer Jensen, RN, MSN, CPNP | Adolescent Medicine Nurse Practitioner
Jennifer Jensen, RN, MSN, CPNP, is a pediatric nurse practitioner in the Division of Adolescent Medicine. She has been on staff at Lurie Children’s (formerly Children’s Memorial Hospital) since 2001. After having worked with HIV infected and affected adolescents and young adults in the Division of Special Infectious Diseases for more than 14 years, she joined the Division of Adolescent Medicine in December 2015. Jennifer received her BSN and MSN from the University of Pennsylvania. She completed a nurse practitioner fellowship in Adolescent Health at Cincinnati Children's Hospital Medical Center in June 2001. Her clinical interests include general adolescent health as well as providing care for gender non-conforming and transgender youth.

Jennifer Leininger | Program Manager
Jennifer Leininger, MEd, manages the Gender & Sex Development Program at Ann & Robert H. Lurie Children’s Hospital of Chicago. As Program Manager, Jennifer leads community, policy and advocacy initiatives. She specializes in working with schools and organizations to be more inclusive of gender diversity. Jennifer continues to develop and implement educational sessions to support the inclusion of gender expansive youth and their families in their schools and communities. Since 2008, Jennifer has provided family-centered, patient support while working in Lurie Children's Division of Adolescent Medicine. Jennifer holds a Master of Education degree from DePaul University in addition to a BS (Marketing) and a BA (Theatre) from Miami University. In addition to her work at Lurie Children's, Jennifer has worked on adolescent and children's programming with other nationally recognized organizations, including the Museum of Contemporary Art, Old Town School of Folk Music and About Face Youth Theatre.