[1] In 1895, he was appointed as Chair of Romance Languages at the University of Missouri, where he served until 1908.
[1] Weeks joined the faculty at Columbia University in New York City in 1909.
[1] In 1910, he founded, in collaboration with Henry Alfred Todd and other scholars, the Romanic Review, and he became general editor of the "Oxford French Series."
He wrote numerous articles in Old French Literature, and was assistant editor on the New Standard Dictionary (1913).
During World War I, he served in the American Field Service in France for six months.