Green's practice while at the firm was diverse. Initially, the firm's practice was primarily criminal defense. As new partners were added, the firm expanded to include civil work, which eventually became the overwhelming majority of the work. Green eventually developed a specialized practice representing churches, including the National Baptist Convention, the African Methodist Episcopal Church, the Church of Our Lord Jesus Christ of the Apostolic Faith, and Father Divine. Additionally, Green represented parties both before and after the Supreme Court's decision in Brown v. Board of Education in an attempt to integrate both the student and teacher populations in area school districts. He remained with the firm until his appointment to the bench.