Lydon was educated at St Eunan's College in Letterkenny, County Donegal; University College Galway; University College Dublin and Trinity College Dublin. His bachelor's degree was in sociology and English; his postgraduate work was in the area of education and psychology. Lydon has also worked as a consulting psychologist. For a number of years, he was a non-executive director of Connsbrook Productions Limited and a non-executive of Corona Holidays Limited in Dublin.
