In 1930, Princeton University established the School of Public and International Affairs, which was originally meant to serve as an interdisciplinary program for undergraduate students in Princeton's liberal arts college. In 1948, the School added a graduate professional program and was renamed to honor Woodrow Wilson, who was the 13th president of the University, governor of New Jersey and the 28th president of the United States. In two of Wilson's speeches at the University – first during its 150th anniversary celebration in 1896 and again at his inauguration as the University's president in 1902 – he mentioned “Princeton in the nation’s service.” This phrase serves as the basis for the University's unofficial motto, which was amended in 2016 to "Princeton in the nation's service and in the service of humanity."