Dr. Derek Tsang is a clinician-investigator in the Radiation Medicine Program, Princess Margaret Cancer Centre. He completed his medical training at Queen’s University, followed by residency in radiation oncology at the University of Toronto. He obtained fellowship training in paediatric radiation oncology at St. Jude Children’s Research Hospital under the supervision of Dr. Thomas Merchant, and completed a Masters’ degree in clinical epidemiology at the Harvard T.H. Chan School of Public Health. He joined the Radiation Medicine Program in 2017 and is a member of the paediatric and adult central nervous system (CNS) tumour site groups.