Waihanga i tētahi putanga matatini ake o tēnei rerenga kōrero He mahi ia hei Tumuaki me te Kaiwhakahaere Matua.
I noho a Irwin ki MediaVest Worldwide mo nga tau e 6 tae noa ki te Mahuru 1999 i uru atu ai ia ki te WPP plc hei Tiamana me te Tumuaki o MindShare Worldwide.