Since graduating with a degree in Politics and Government in 1978, Paddy has worked in a number of aspects of public health and social care, including alcohol and drug services, the probation service and public health advocacy. In addition to these he has worked in event management, including directing five editions of the International Harm Reduction conference. Since 2012 he has been mainly involved in the development and promotion of Tobacco Harm Reduction, including directing the Global Forum on Nicotine.