Latest COVID-19 Updates | Updated Visitor Policy
CLOSE

Patients & Families

For Health Professionals

Johns Hopkins All Children's Hospital

Meet Our Center for Behavioral Health Team

 |   Our Services  |  Institute for Brain Protection Sciences  |  Programs and Services  |  Center for Behavioral Health  |  Meet our Team

In This Section  

Meet our Team

Psychiatry

Psychology

Neuropsychology

Children, Teens and Florida’s Baker Act

Contact Us  

Related Pages  

External Links  

Jennifer Katzenstein, PhD

Jennifer Katzenstein, PhD

Neuropsychology
Dr. Katzenstein is the director of psychology, neuropsychology and social work, at Johns Hopkins All Children’s Hospital. Previously, Dr. Katzenstein was a private practitioner and Assistant Professor of Neurology at Indiana University School of Medicine/Riley Hospital for Children in Indianapolis where she provided neuropsychological evaluations, consultations and academic coaching for children and adolescents. After graduating from Indiana University Purdue University Indianapolis, she completed a pediatric internship and fellowship at Texas Children's Hospital/Baylor College of Medicine. Dr. Katzenstein is board certified in pediatric neuropsychology and clinical neuropsychology.
View Jennifer Katzenstein’s Bio
Danielle Ransom, PsyD

Danielle Ransom, PsyD

Neuropsychology
Dr. Ransom specializes in neuropsychology at Johns Hopkins All Children’s Hospital. She joined the medical staff in 2019. Before joining Johns Hopkins All Children’s, Dr. Ransom was an assistant professor at the University of Miami Miller School of Medicine where she co-directed the Pediatric Concussion Clinic and developed the neuropsychology arm of the Sports Concussion Clinic.
View Danielle Ransom’s Bio

Jeffrey L. Alvaro, MD

Jeffrey L. Alvaro, MD

Child and Adolescent Psychiatry
Dr. Alvaro specializes in pediatric psychiatry in the Institute for Brain Protection Sciences at Johns Hopkins All Children’s Hospital. He treats all psychiatric conditions in children and adolescents with a particular interest in ADHD, anxiety disorders and mood disorders. He joined the hospital staff in 1999. Dr. Alvaro also is an affiliate professor in the department of Psychiatry and Behavioral Neurosciences at the University of South Florida. He earned his medical degree from the University of South Florida, where he also completed a residency in general adult psychiatry followed by a fellowship in child and adolescent psychiatry.  He served as chief resident during the final year of his fellowship.
View Jeffrey L. Alvaro’s Bio
Mark Cavitt, MD

Mark Cavitt, MD

Child and Adolescent Psychiatry
Dr. Cavitt is the Medical Director of Pediatric Psychiatry Services and serves as Chair of the Division of Neurology, Psychiatry, Psychology & Developmental Pediatrics. He is board certified in child and adolescent psychiatry as well as general psychiatry. He is an Assistant Clinical Professor for the University of South Florida, College of Medicine and an Associate Professor of Psychiatry at Lake Erie College of Medicine, Bradenton and Instructor in Pediatrics at Johns Hopkins Medicine.  Dr. Cavitt graduated from the Quillen College of Medicine at East Tennessee University. His recent awards include Best Doctors of Tampa Bay (2007-2018); Educator of the Year (2015) at the University of South Florida.
View Mark Cavitt’s Bio
Reena Thomas, MD

Reena Thomas, MD

Child and Adolescent Psychiatry
Dr. Thomas is a child and adolescent psychiatrist for the Johns Hopkins All Children’s Institute for Brain Protection Sciences. She joined hospital staff in 2018. Dr. Thomas earned her medical degree from American University of Integrative Sciences. She trained in psychiatry at Virginia Tech Carilion School of Medicine in Roanoke, Virginia. Dr. Thomas then completed a child and adolescent psychiatry fellowship at Children’s Hospital of Philadelphia in Pennsylvania.
View Reena Thomas’s Bio

Dianna Boone, PhD

Dianna Boone, PhD

Psychology
Dr. Boone is a pediatric psychologist at Johns Hopkins All Children’s Hospital. She joined the hospital staff in 2022. Dr. Boone sees patients as part of the Healthy Weight Initiative and provides weekly outpatient therapy to patients with weight management concerns. She also provides weekly outpatient therapy to patients with anxiety, depression, and adjustment disorders.
View Dianna Boone’s Bio
Sakina Butt, PsyD

Sakina Butt, PsyD

Psychology Neuropsychology
Dr. Butt is a neuropsychologist at Johns Hopkins All Children’s Hospital. She joined the hospital staff in 2019. Some of Dr. Butt’s areas of clinical expertise include neuropsychological evaluations and consultations for children in the neonatal intensive care unit and pediatric intensive care unit.
View Sakina Butt’s Bio
Lacy Chavis, PsyD

Lacy Chavis, PsyD

Psychology
Dr. Chavis is a pediatric psychologist in the Johns Hopkins All Children’s Institute for Brain Protection Sciences. She holds specialty certification in evaluation and treatment of perinatal mental health. She provides consultation, evaluation and treatment intervention services on the inpatient units regarding adaptation and coping with illness, treatment adherence, and emotional and behavioral functioning. She joined the hospital staff in 2012. Dr. Chavis received her doctoral degree in clinical psychology from Illinois School of Professional Psychology-Argosy University. She completed a pediatric internship in clinical psychology at New York Center for Child Development with emphasis on early childhood development and trauma. Dr. Chavis continued to specialize with fellowship at Andrus Children’s Center focusing on trauma, parent-child interactions and maternal mental health. Dr. Chavis’ research interests include neurodevelopmental and social-emotional outcomes of premature infants, maternal mental health and the cost-effectiveness of early psychological intervention.
View Lacy Chavis’s Bio
Melissa Faith, PhD

Melissa Faith, PhD

Psychology
Dr. Faith is a clinical pediatric psychologist specializing in hematology/oncology at Johns Hopkins All Children’s Hospital. She received her master’s and doctorate degrees in clinical psychology from the University of Arkansas, completed a predoctoral internship in clinical child psychology at the University of Mississippi Medical Center and completed a postdoctoral fellowship in clinical psychology with an emphasis in pediatric hematology and oncology at the University of Oklahoma Health Sciences Center. Dr. Faith’s research interests include disseminating evidence-based interventions in large medical and community centers (e.g., motivational interviewing) as well as emotion socialization, social adjustment, and sibling adjustment during and following childhood chronic illness. 
View Melissa Faith’s Bio
Marissa Feldman, PhD

Marissa Feldman, PhD

Psychology
Dr. Feldman is a pediatric psychologist in the Johns Hopkins All Children’s Institute for Brain Protection Sciences. She specializes in the evaluation and treatment of children and adolescents with acute and/or chronic medical conditions to promote psychological health and well-being, and provides consultation services on the inpatient units regarding adaptation and coping with illness, treatment adherence, and emotional and behavioral functioning. She joined the hospital staff in 2017. Dr. Feldman received her Doctoral degree in clinical psychology from the University of South Florida, and completed her internship and fellowship at the Ann & Robert H. Lurie Children’s Hospital of Chicago (formerly Children’s Memorial Hospital). Dr. Feldman’s research interests include treatment adherence and quality of life in patients with chronic illness, outcomes of group intervention, psychosocial factors contributing to positive youth development and negative peer relations. 
View Marissa Feldman’s Bio
Alyssa Fritz, PhD

Alyssa Fritz, PhD

Clinical Psychology
Dr. Fritz is a pediatric psychologist in the Johns Hopkins All Children’s Institute for Brain Protection Sciences. She joined the hospital staff in 2018. Dr. Fritz provides evidence-based interventions for pre-school and early childhood disruptive behavior disorders.
View Alyssa Fritz’s Bio
William Frye, PhD

William Frye, PhD

Psychology
Dr. Frye is a pediatric psychologist in the Chronic Pain Clinic at Johns Hopkins All Children’s Hospital. He specializes in non-pharmacological treatment for patients with acute and chronic pain conditions and provides skill-based interventions for simultaneous psychosocial concerns. He joined the hospital staff in 2018. Dr. Frye earned his doctoral degree in clinical psychology from Auburn University. He completed a pre-doctoral internship in pediatric psychology at Children’s Mercy Hospitals and Clinics and a postdoctoral fellowship in chronic pain at Nationwide Children’s Hospital. Dr. Frye’s research interests include pain coping and catastrophizing and parental impact on youth outcomes. He is Board Certified in Biofeedback (BCB) by The Association for Applied Psychophysiology and Biofeedback.
View William Frye’s Bio
Lauren Gardner, PhD

Lauren Gardner, PhD

Psychology
Dr. Gardner is the psychology internship director and administrative director of the Autism Program at Johns Hopkins All Children’s Hospital. She has provided services for children and families with a wide range of concerns, including noncompliance, autism spectrum disorder, developmental disabilities, depression, anxiety and social skills deficits. Dr. Gardner’s clinical interests include neurodevelopmental disabilities. She earned her doctorate degree from Indiana University Bloomington and completed an internship in psychology at the University of Tennessee Health Science Center and a fellowship in developmental/behavioral pediatrics at the Boling Center for Developmental Disabilities.
View Lauren Gardner’s Bio
Callie Gilchrest, PhD MEd

Callie Gilchrest, PhD MEd

Psychology
Dr. Gilchrest is a pediatric psychologist who specializes in assessment and treatment of autism and other neurodevelopmental disorders. She primarily works in the autism and developmental pediatrics programs on the Johns Hopkins All Children’s Hospital main campus in St. Petersburg, Florida. She joined the hospital staff in 2022.
View Callie Gilchrest’s Bio
Jason Hangauer, PhD

Jason Hangauer, PhD

Psychology
Dr. Hangauer is a pediatric outpatient psychologist at Johns Hopkins All Children’s Hospital. He specializes in the evaluation and treatment of autism spectrum disorder (ASD) and developmental disabilities. He joined hospital staff in 2018. Dr. Hangauer's research interests include evidence-based interventions for ASD, behavioral parent training, and assisting allied providers serving children with ASD and other disorders in the use of current research supported best practices.
View Jason Hangauer’s Bio
Aja Meyer, PhD

Aja Meyer, PhD

Psychology
Dr. Meyer earned her doctorate degree from the University of South Florida, and completed an internship at the Children's Hospital of Michigan and a post-doctoral fellowship at Akron Children's Hospital. Dr. Meyer has provided psychological services to children and adolescents with a broad range of medical conditions, such as diabetes, kidney disease, sickle cell anemia, cancer, and various neurological conditions (e.g., AVM, cerebral palsy, chronic pain, epilepsy, spinal cord injury, stroke, and traumatic brain injury). She provides consultation services on the inpatient units at Johns Hopkins All Children's Hospital and sees outpatients as part of the All Children's Pediatric Psychiatry program.
View Aja Meyer’s Bio
Jonathan Poquiz, PhD

Jonathan Poquiz, PhD

Psychology
Dr. Poquiz is a pediatric psychologist in the Gender Affirming Care Clinic at Johns Hopkins All Children’s. He joined the hospital staff in 2021. Dr. Poquiz specializes in providing outpatient and interdisciplinary care for transgender and gender diverse youth, as well as for youth with differences in sex development/intersex diagnoses.
View Jonathan Poquiz’s Bio
Sarah Sobalvarro, PhD

Sarah Sobalvarro, PhD

Psychology
Dr. Sobalvarro is a pediatric psychologist in the Johns Hopkins All Children’s Institute for Brain Protection Sciences. She joined the hospital staff in 2019. In her role, Dr. Sobalvarro sees patients in the weight management and eating disorder clinics and provides weekly therapy for patients with disordered eating, body dissatisfaction, weight management concerns and psychological conditions.
View Sarah Sobalvarro’s Bio