Consultant and Head of Department of Endocrinology, UCH-UMC Ljubljana, a clinical pharmacologist, Head, Chair of Pediatrics, and Professor of Pediatrics at Faculty of Medicine, University of Ljubljana, Slovenia. Completed his medical degree at the University of Ljubljana. He completed a Master degree, and later a PhD focusing on glucose metabolism in neonatal endotoxic shock in 1996. He completed his clinical fellowship at Loyola University of Chicago and his postdoctoral fellowship at INSERM, Paris.

PI on several research projects in the field of paediatric endocrinology and metabolism and was awarded the Slovene national award for research in 2014. Professor Battelino is a member of numerous professional associations including the European Society for Paediatric Endocrinology and the International Society for Pediatric and Adolescent Diabetes, for which he served as President for the 35th Annual Congress. He served on the European Association for the Study of Diabetes (EASD) council and is co-organizer of eleven annual meetings of the ATTD (Advanced Technologies and Treatment of Diabetes). He has authored or co-authored over 190 manuscripts in international peer-reviewed journals and participated chapters to several books.