Jack Greenberg (December 22, 1924 – October 12, 2016) was an American attorney and legal scholar. He was the Director-Counsel of the NAACP Legal Defense Fund from 1961 to 1984, succeeding Thurgood Marshall. He was involved in numerous crucial cases, including Brown v. Board of Education, which ended segregation in public schools. In all, he argued 40 civil rights cases before the U.S. Supreme Court, and won almost all of them.