Meet Our Urologists

Sisir Botta, M.D. Urology

Dr. Botta specializes in pediatric urology in the Johns Hopkins All Children’s Hospital Department of Surgery. He earned his medical degree from the University of Tennessee College of Medicine. Dr. Botta trained at Medical College of Georgia and completed a fellowship in urology at the University of California, San Francisco.
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Katherine Corbyons, M.D. Urology

Dr. Corbyons specializes in pediatric urology in the Johns Hopkins All Children’s Hospital Department of Surgey. She earned her medical degree from the University of Florida College of Medicine, where she also completed her internship and residency. Dr. Corbyons then completed a fellowship at Cincinnati Children’s Hospital Medical Center.
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Mark Kolligian, M.D. Urology

Dr. Kolligian specializes in pediatric urology in the Johns Hopkins All Children’s Hospital Department of Surgery. He earned his medical degree from New York Medical College and completed his internship and residency at New York Medical College affiliated hospitals. Dr. Kolligian then completed a fellowship at Children’s Memorial Hospital in Chicago, Illinois. Additionally, Dr. Kolligian is a clinical associate professor of urology and pediatrics for the University of South Florida Morsani College of Health.
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Ethan Polsky, M.D. Urology

Dr. Polsky specializes in pediatric urology in the Johns Hopkins All Children’s Hospital Department of Surgery. He earned his medical degree from the University of Kentucky College of Medicine, where he also completed his internship and residency. Dr. Polsky then completed a fellowship in pediatric urology at Children’s Hospital of Pittsburgh, University of Pittsburgh Medical Center. Additionally, Dr. Polsky is a clinical associate professor of urology and pediatrics for the University of South Florida.
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