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Greg Armstrong MD, MSCE, joined the Department of Epidemiology and Cancer Control at St. Jude Children's Research Hospital in 2006. Dr. Armstrong is the Principal Investigator of the Childhood Cancer Survivor Study (CCCS). The CCSS is a multi-institutional, collaborative cohort study initiated in 1994, which has successfully established and followed a cohort of five-year survivors of childhood cancer diagnosed between 1970-1999 and a population of sibling controls. The cohort, derived through 31 original participating clinical centers, has collected detailed information on cancer diagnosis, therapy received along with health-related long term outcomes. As such he provides oversight for three ongoing, R01 funded intervention trials. His research has provided novel identification of a reduction in late mortality among survivors of childhood cancer from more recent eras attributable to reduced treatment exposure, extending the lifespan of these survivors (NEJM 2016). In addition to maintaining a clinical practice in both pediatric Neuro-Oncology and pediatric cancer survivor care.