Johns Hopkins All Children's Hospital

Meet Our Team

Roberto A Sosa,  M.D.

Dr. Sosa was named medical director of Johns Hopkins All Children’s International Patient Services in 2013 after nearly 40 years as the leader of the hospital’s regional neonatology program. He has helped develop medical education and research projects in Latin America, including his native Guatemala, and participates in international conferences to provide education and foster clinical relationships with children’s health providers around the globe.

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Nahed Dajani

Senior international care coordinator


Diana Retzer 

Diana Retzer serves as the international financial coordinator. She has been an employee with Johns Hopkins All Children's Hospital for several years, working in Patient Access and Admitting and Registration. She provides an invaluable knowledge of Johns Hopkins All Children's Hospital's internal culture and processes.