Through personal anecdote, screenwriter and actor Mark O’Halloran (Adam and Paul, Garage, Viva) discusses ‘the substance of things unseen’ and the idiom of ‘write what you know.’ Recorded live at the Fleadh Forum, an annual state-of-the-industry conference taking place as part of the Galway Film Fleadh.

Mark’s new film as screenwriter, Rialto, premieres at the BFI London Film Festival on Saturday.