Dr. Friso G.J. Calkoen is a Post Doctoral Researcher and Pediatric Oncologist at the stem cell transplantation and cellular therapy unit in the Princess Maxima Center for Pediatric Oncology. He obtained his Ph.D. degree in pediatric disease from Leiden University in 2009–2013. He worked as a resident in pediatrics at Leiden University Medical Center in 2014–2018 and a fellowship in pediatric oncology at Princess Maxima Center in 2018–2020. His main research areas include cellular therapy, CAR T cells, Stem Cell Transplantation, Acute Lymphoblastic Leukemia (ALL), and Immunotherapy.