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Johns Hopkins Children’s Center

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Our Team


Photo of Dr. John P Gearhart, M.D.

Gearhart, John P, M.D.

Professor of Urology
Professor of Pediatrics
Robert D. Jeffs Professor
Director of Pediatric Urology
Expertise, Disease and Conditions: Ambiguous Genitalia, Bladder Exstrophy, Major Urologic Birth Defects, Pediatric Urology, Urologic Surgery, Urology


Photo of Dr. Heather Noelle Di Carlo, M.D.

Di Carlo, Heather Noelle, M.D.

Assistant Professor of Urology
Director, Pediatric Urology Research
Expertise, Disease and Conditions: Bladder Cancer, Bladder Exstrophy, Hernias, Hypospadias, Kidney Cancer, Pediatric Urology, Prostate Cancer, Undescended Testis, Urology, Vesicoureteral Reflux
Photo of Dr. Jennifer Lockwood Dodson, M.D., Ph.D.

Dodson, Jennifer Lockwood, M.D., Ph.D.

Assistant Professor of Urology
Expertise, Disease and Conditions: Pediatric Urology, Spina Bifida, Urology, Voiding Dysfunction


Jessica Hankinson, Ph.D.
Pediatric Psychologist in Pediatric Medical Psychology

Phone: 410-955-1855

Dr. Hankinson serves as the primary behavioral consultant to the Division of Pediatric Urology. Dr. Hankinson is part of a multidisciplinary team that evaluates and treats children with urological conditions.

Karen Spriggs, R.N.
Pediatric Urology Nurse Clinician

Phone: 410-614-6304

Karen has been a registered nurse since 1990. She has specialized in pediatrics her entire career. Since 2000 she has specialized in pediatric urology, including surgical care for children. Karen is an expert in the treatment of kids who have bladder problems. She compassionately and enthusiastically works closely with families whose children receive inpatient and outpatient treatments in the Division of Pediatric Urology.

Sally Sawyer
Phone: 410-955-9129
Fax: 410-955-7909

Once you and your child’s urologist have agreed that surgery is necessary you will meet Sally, who will schedule surgery for your child.

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