Cormac O’Raifeartaigh (Cormac O’Rafferty) is an Irish physicist based at Waterford Institute of Technology in Ireland. A solid-state physicist by training, he is best known for several contributions to the study of the history and philosophy of 20th century science, in particular his discovery that Albert Einstein once attempted a steady-state model of the expanding universe, many years before Fred Hoyle Cormac is the youngest son of the late Lochlainn O'Raifeartaigh, an Irish theoretician who is considered one of the architects of the Standard Model of particle physics.