In 1946 Mossner joined the English faculty of the University of Texas at Austin, serving for several years as editor of Texas Studies in Language and Literature. While on a Fulbright Research Fellowship in 1968 he was a visiting professor at Glasgow University, where he would later become a member of a committee established by the University to edit a scholarly edition of the works of Adam Smith. In 1970 he was named Ashbel Smith Professor of English and Philosophy at the University of Texas.[1] He retired from teaching in 1972, and in 1976 received the honorary D.Litt. from Edinburgh University.