sentences:  From 2003 to 2007, Lockhart served on the faculty of the Master of Science in Foreign Service Program at Georgetown University's Walsh School of Foreign Service.In this role, Lockhart was chairman of the program's concentrations in international business-government relations and global commerce and finance, while teaching courses in international investment, global business strategy, and other subjects.He also was an adjunct professor at Johns Hopkins University's School of Advanced International Studies.