Head of the Research Unit Innovative Therapies for Endocrinopathies at Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy. He is Emeritus Professor of Paediatric Endocrinology and Paediatrics at La Sapienza University of Rome and Emeritus Professor of Paediatrics at the University of Tor Vergata, Rome, Italy. Professor Cappa’s specialties include endocrinology, paediatrics, and sports medicine. From 2011 to 2013, he served as President of the Italian Society of Paediatric Endocrinology and Diabetology (ISPED). In May 2025, he received the ESPE Outstanding Clinician Award. His main scientific areas of interest include neuroendocrinology and genetics, growth hormone testing, adrenoleukodystrophy, congenital adrenal hyperplasia, Prader–Willi syndrome, and rare thyroid disorders. He is a member of several professional organizations, including the Italian Society of Paediatric Endocrinology and Diabetes, the Italian Society of Endocrinology, the Italian Association of Clinical Endocrinologists (AME), The Endocrine Society, and the European Society for Paediatric Endocrinology. He serves as a reviewer for several international journals. Author and co-author of more than 480 publications (with 3,865 citations and an h-index of 53), he is also editor of 15 international books, author of more than 150 book chapters, and has conducted over 30 clinical trials in the field of paediatric endocrinology.