Nathan Lewin has engaged in trial and appellate litigation in federal and state courts for 40 years.
As an assistant to the solicitor general in the Department of Justice under Archibald Cox and Thurgood Marshall, Lewis argued 12 cases before the Supreme Court. Since entering private practice, he has argued in the Supreme Court another 15 times, for a total of 27 arguments in the Supreme Court. His Supreme Court cases have included the representation of banks and other commercial interests, criminal cases, and issues of constitutional law.
Lewin was law clerk for Chief Judge J. Edward Lumbard of the 2nd U.S. Circuit Court of Appeals from 1960 to 1961 and to Associate Justice John M. Harlan of the Supreme Court from 1961 to 1962. Lewin served as deputy assistant attorney general in the civil rights division of the Department of Justice, and had previously served as deputy administrator of the Bureau of Security and Consular Affairs at the Department of State.
After leaving government service, he was a founding partner of Miller Cassidy Larroca and Lewin, one of the nation's foremost litigation “boutiques” for more than 30 years.