Shaun MacMahon, PhD is a Research Chemist with the Center for Food Safety and Applied Nutrition (CFSAN) of the U.S. Food and Drug Administration (FDA) in College Park, MD. After completing his Ph.D. in Organic Chemistry from New York University, Shaun worked as a Chemist with the FDA’s Office of Regulatory Affairs in Jamaica, NY, before coming to CFSAN in 2009. His main interest is the application of mass spectrometry to address food safety issues. Shaun has been an active member of the American Oil Chemists’ Society since 2010 and has co-chaired the Trace Contaminants session at the AOCS Annual Meeting for the last three years.