Byrnes has taught composition at Illinois Wesleyan University as adjunct assistant professor of composition, at Indiana University as associate instructor of composition, and at Ball State University as assistant professor of composition and theory.
Professor Byrnes has shared his expertise in teaching English composition at several universities, including Illinois Wesleyan University, where he worked as an adjunct instructor, Indiana University, where he was an associate lecturer, and Ball State University, where he held the position of assistant professor for both composition and theoretical studies.