Dr. Killeen joined Matrivax as Chief Scientific Officer in 2009. He has extensive training in the fields of vaccinology, molecular biology, microbiology, protein chemistry, and immunology. Dr Killeen’s experience includes identifying and leading the in-licensing effort of the rotavirus vaccine candidate 89-12, now Rotarix®, a blockbuster vaccine commercialized by GSK. Prior to Matrivax, he led vaccine research and development programs at IDEXX Corp. and AVANT-Celldex. He directed 7 vaccine candidates into Phase 1 and 2 clinical trials, guided the R&D of CholeraGarde®, an oral, single-dose, cholera vaccine into a Phase 3 clinical trial, and commercialized two diagnostic tests. He has authored dozens of peer-reviewed articles, chapters, reviews, is the inventor on multiple patents, is a former editor of the journal Human Vaccines and Immunotherapies, and a member of the Dean’s Advisory Council at URI. Dr. Killeen was the principal investigator on vaccine related grants and contracts exceeding $11 million and coordinated greater than $13 million in funding from the Bill & Melinda Gates Foundation. Dr. Killeen holds a Ph.D. in microbiology from the University of Rhode Island. He completed a post-doctoral fellowship at Harvard Medical School in molecular genetics and protein toxin chemistry.