Brian Devlin was a  Catholic priest in Edinburgh in the mid 1980s. Following the appointment of Keith O’Brien as Archbishop of St Andrews and Edinburgh, Devlin left the priesthood and worked in a street project in Leith helping IV drug users at the time of the AIDS epidemic in Edinburgh. 

In 2013 he, together with three other priests, went public about the sexual hypocrisy of then Cardinal Keith O’Brien.  He is the author of Cardinal Sin: Challenging Power Abuse in the Catholic Church which was published by Columba Books in August 2021.