 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.