Judge Matsumoto was appointed the the United States District Court (EDNY) in 2008, after serving as a United States Magistrate Judge from 2004-2008, and an Assistant United States Attorney (EDNY) where she served as Chief of the Civil Division and other capacities. She is a graduate of Georgetown University Law Center and the University of California at Berkeley. She has taught at Brooklyn Law School, New York University Law School and has spoken at other law schools around the country. She currently serves on the United States Judicial Conference Committee for International Judicial Relations.