Sack has written and lectured on the subjects of national and international press law. He is coauthor with the late P. Cameron DeVore of the first edition of
Advertising and Commercial Speech: A First Amendment Guide (1999). His article, "Protection of Opinion Under the First Amendment: Reflections on Alfred Hill,"
Defamation and Privacy Under the First Amendment, was published in the 100th Anniversary issue of the Columbia Law Review; and "
New York Times Co. v. Sullivan, 50-Year Afterward," 66 Alabama L. Rev. 273 (2014), on the 50th Anniversary of
Sullivan. Sack has also specialized in First Amendment law, offering courses as an adjunct professor from 2001 to 2023 at Columbia Law School. He was Columbia Law School's commencement speaker in 2007. He was Adjunct Professor of Political Science and Special Guest Lecturer at the University of Rochester in 2012 and a Distinguished Visiting Jurist at the University of Chicago Law School in 2013. Sack was an officer and director of the William F. Kerby and Robert S. Potter Fund, which assisted in funding the legal defense of journalists abroad, and a member of the advisory boards of the Bureau of National Affairs'
Media Law Reporter and the ABA Forum Committee's
Communications Lawyer. He is a member of the Board of Visitors of Columbia Law School, and he was a member of the Board of Trustees of Columbia University Seminars on Media and Society. Sack was an Adviser to American Law Institute's Restatement Third of Torts, Defamation and Privacy, 2019-, and an Adviser to Global Media Freedom Initiative's High-Level Panel of Legal Experts convened at the request of the UK and Canadian government, 2019-20. He is a member of the American Bar Association, the New York City Bar Association (Chair, Communications Law Committee, 1986-89), and the American Judicature Society. Sack is a Fellow of the American Bar Foundation. In May 2008, Sack was awarded the
Learned Hand Medal for excellence in federal jurisprudence by the
Federal Bar Council. == Personal life ==