David McDonald worked in Ireland’s biggest prisons for over thirty years. He started out with a baptism of fire in 1989 in Mountjoy, before returning to his hometown two years later to Portlaoise Prison, which – due to the presence of IRA and other subversive prisoners – was then the most secure prison in Europe. He then moved on to the new Midlands prison, where Ireland’s emerging class of serious gangsters were housed. Here he dealt with notorious household names like John Gilligan, Christy Kinahan, Brian Meehan, Dessie O’Hare and, more recently, killers like Graham Dwyer, in his average working day. David is the co-author of 'Unlocked: An Irish Prison Officer's Story'.