Lev L. Dassin (born 10 September 1965) was acting US Attorney for the Southern District of New York from December 2008 until August 2009.
Dassin received his bachelor's degree from Cornell University and his JD from New York University School of Law. He was a law clerk for judge David N. Edelstein.
Dassin served as an Assistant US Attorney for the Southern District of New York from 1992-1998. He then was in private practice until he returned to that district in 2005 as Chief of its Criminal Division. He rose to the position of Deputy United States Attorney for the District in January 2008.
Despite only serving eight months Dassin oversaw many high-profile cases. His office prosecuted Bernard Madoff, Marc Dreier and Abduwali Muse. His office also represented the Federal Government interests in the Chrysler and General Motors bankruptcy cases.
Dassin is currently a white collar crime defense lawyer with the law firm of Cleary Gottlieb Steen & Hamilton. He has served as an adjunct professor of law at Columbia Law School since 1999.