J Grandy is a pediatric nephrologist who has focused on the development of pediatric haemodialysis, specialty in infants. He runs the Pediatric Haemodialysis Unit of The Hospital Exequiel Gonzalez Cortes, Santiago, Chile, since its opening in 2006. In 2015 he started on-line haemodiafiltration therapy in children showing its results around Latin America, encouraging nephrologists to improve the quality of dialysis in children. Recently, he has published his large experience on haemodialysis in infant and children weighing less than 15 kg. Nowadays, he is still working with passion to provide the best quality of dialysis in pediatric patients.