Christian teaches a variety of courses at Boston University School of Law, including American Constitutional History, Fundamentals of U.S. Constitutional Law, Constitutional History: The Founding Years, and Constitutional History: The Civil War and Reconstruction.

Christian frequently speaks about various legal and historical topics and provides consulting services for historical programs and exhibitions. C-SPAN has broadcast two of his talks. Some of Christian’s selected speaking engagements include:

• A program about the Thirteenth Amendment for the U.S. Commission on Civil Rights held at President Lincoln’s Cottage in Washington, D.C. and televised on C-SPAN (watch it here)
• “Nation-building and the law during the Era of the Civil War and Reconstruction,” University of Connecticut
• A Massachusetts Bar Association program concerning obtaining lost profits damages for startup businesses in intellectual property litigation
• “The Era of the War of 1812 and the Making of Modern America,” Massachusetts Historical Society in partnership with the USS Constitution Museum
• “The Complexity of Kentucky and the Complexities of Citizenship during the Age of Emancipation,” University of Louisville
• Keynote Speaker, Civil War Trust Teacher Institute, Boston, Massachusetts (televised on C-SPAN)
• Boston Public Library (separate talks about citizenship during the Civil War era and Boston’s Irish Americans during the Civil War era)
• The Franklin N. Flaschner Judicial Institute (Bench/Bar Reading Discussion Series event with judges from the Massachusetts Trial Court and Massachusetts Appeals Court concerning his book, Becoming American under Fire: Irish Americans, African Americans, and the Politics of Citizenship during the Civil War Era)
• Various continuing education programs for secondary school social studies teachers administered by the Massachusetts Historical Society, Suffolk University, and University of Massachusetts-Boston

Christian is a Fellow at the Massachusetts Historical Society and a member of the Board of Overseers at the USS Constitution Museum.