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Schall was in private practice with the law firm of Shearman and Sterling in New York City from 1969 to 1973, before becoming an Assistant United States Attorney in the Eastern District of New York from 1973 to 1978. He was chief of the appeals division from 1977 to 1978, and a trial attorney of the civil division of the United States Department of Justice from 1978 to 1987. He was a senior trial counsel from 1986 to 1987. He briefly returned to private practice in Washington, D.C. from 1987 to 1988, with the law firm of Perlman and Partners, and was then an Assistant to the United States Attorney General from 1988 to 1992. In 1989, he authored the "Federal Contract Disputes and Forums", chapter in Construction Litigation: Strategies and Techniques, published by John Wiley and Sons.