Professor O’Sullivan is the founding president of the UK Association of Language Testing and Assessment and holds honorary and visiting chairs at the Universities of Reading and Roehampton in the UK and the University of Technology MARA (Kuala Lumpur) and at the University of Lisbon. His recent work includes the development and validation of a new business to business language test called Aptis.
In 2016 Professor O’Sullivan was awarded fellowship of the Academy of Social Science.