Corrigan was helping out on the coaching side of things under Michael Cheika by that stage but had already been long impressed by how Cullen went about his business. Leo Cullen in action during his playing days with Leicester. “He brought back different methodologies, different ways of looking at things, maybe a different attitude and certainly a different level of professionalism to Leinster. Leinster head coach Leo Cullen and James Lowe celebrate winning the URC final. Leo Cullen.