Prior to coming to OU, Robertson served as a lecturer in federal Indian law at the University of Virginia School of Law from 1990 to 1994 and in 1996, as well as at the George Washington University National Law Center in 1996. He was also a Research and Visiting Fellow at the Philadelphia Center for Early American Studies from 1992 to 1994.
He worked in private practice in Washington, DC, and Charlottesville, Virginia, and as a judicial clerk at the United States District Court for the District of Delaware.
Robertson is the author of Conquest by Law (forthcoming).