David Rosen was Assistant United States Attorney for the Eastern District of Missouri for 32 years. His responsibilities for that office included prosecution of labor racketeering, organized crime, official corruption, and white collar crime cases. Professor Rosen received his J.D. in 1975 from Washington University and his B.A. in 1972 from the University of Wisconsin in Madison. Professor Rosen has taught a trial course for Washington University since 1996, has supervised a number of Washington University students who have taken a supervised practicum course at the U.S. Attorney’s Office, and currently teaches an Evidence course for the law school.