Rohan complete a Master of Theology at the Catholic Institute of Sydney before heading to Canberra to teach at Australian Catholic University for eighteen months. In 2005 he was awarded the Dr John Charles Beer Travelling Fellowship for Lonergan Studies which enabled Rohan to read for his doctorate at Regis College, the Jesuit Graduate Faculty of Theology at the University of Toronto. Rohan joined the faculty at the Catholic Institute of Sydney as a lecturer in theology upon his return to Australia in 2010.

Rohan is a member of Alpha Sigma Nu and an Affiliate Research Fellow at the Australian Catholic University. He served as the Secretary of the Australian Catholic Theological Association from 2012–2015 and in 2016 was elected as its Vice President.

At CIS Rohan held the position of Academic Registrar from 2013 until early 2016 at which time he was appointed Academic Dean. He was a Post-Doctoral Fellow at the Lonergan Institute at Boston College for Semester 2, 2016. In 2018 Rohan was appointed to the position of Deputy President at CIS.