He returned to Princeton to become an instructor in astronomy (1905–1908), assistant professor (1908–1911), professor (1911–1927) and research professor (1927–1947).
Вратио се у Принстон да би постао инструктор астрономије (1905–1908), асистент (1908–1911), професор (1911–1927) и професор истраживач (1927–1947).