He is a member of the Cell Response and Regulation Program.Stewart's research focuses on cell migration and cancer metastasis mechanisms using the zebrafish model. He is also interested in the discovery of new therapeutic targets in melanoma and neuroblastoma, cancers of the neural crest.Before joining HCI, Stewart was a research fellow in the Department of Pediatric Oncology at Harvard Medical School, Dana-Farber Cancer Institute, where he also served as an instructor in pediatric oncology. He earned a PhD from Yale University, New Haven, Connecticut.