John O'Sullivan's background is in newspaper and magazine editing, with experience in Irish national titles and specialist publications, in coverage of ICT and in digital media initiatives.
He has taught at DCU since 1996, across a wide range of topics in journalism and communication, from print news design to social media, and has served as Chair of the MA in Journalism programme.
He has published in leading peer-reviewed journals, primarily focusing on journalism and digital (or post-digital) media. He is a founding vice-president of the Journalism Studies Section of European Communication Research and Education Association (ECREA) and a former member of the editorial board of Digital Journalism.
Past and current postgraduate research supervision topics include digital news practice, content and strategies; journalism norms in Cambodia; and social media and democracy in Cambodia.