Andrew A. Weissmann is an American attorney and law professor born in New York City in 1958. He has held positions in both government and private practice throughout his career, alternating between public service and work at the law firm Jenner & Block in New York. Weissmann began his government career as an Assistant United States Attorney from 1991 to 2002, during which time he prosecuted high-profile organized crime cases. Later, he served as chief of the Fraud Section in the Department of Justice from 2015 to 2017. He gained significant public attention as a lead prosecutor in Robert S. Mueller's Special Counsel's Office from 2017 to 2019. In addition to his legal practice, Weissmann has been involved in legal education, teaching at multiple institutions including New York University School of Law, Fordham Law School, and Brooklyn Law School. He is currently a professor at New York University School of Law.