Kurzban has litigated over 50 federal cases concerning the rights of aliens, including Jean v. Nelson, Commissioner v. Jean, and McNary v Haitian Refugee Center, Inc., which he argued before the United States Supreme Court. He has also litigated numerous cases under the Alien Tort Claims Act and the Torture Victim Protection Act, including obtaining a $500 million judgment against Jean-Claude Duvalier, the former dictator of Haiti. He recently prevailed against the U.S. Department of Homeland Security, after a 23-year battle, to gain U.S. citizenship for English-born rapper Slick Rick. Kurzban also served as U.S. attorney for Haiti's elected governments since 1991 (led by Jean-Bertrand Aristide (1991 & 1994-96), René Préval (1996-2000), and Aristide again (2000–04)). After Aristide was forced from office and cast into exile, Kurzban has served as the former president's personal attorney in the United States. On March 18, 2011, Aristide, accompanied by Kurzban and others, returned to Haiti. First published in 1990, "Kurzban's Immigration Law Sourcebook" has become one of the most respected one-volume treatises on immigration law, particularly among attorneys, judges, and government officials involved with immigration issues. The original 490-page edition was derived from notes Kurzban used while teaching immigration law. Now in its 16th edition, the "Sourcebook" has since grown to over 2500 pages. The book has been cited by administrative tribunals, federal courts, and state supreme courts.