Mirvac Group board appoints new chair Business Breaking News Business National Property developer Mirvac has appointed former Suncorp chief executive John Mulcahy as its new chairman. Mr Mulcahy will replace James MacKenzie, who will step down at the company's annual general meeting in November. Mr Mulcahy has been on the Mirvac board since November 2009, and prior to that was chief executive of Suncorp. He has also worked at Commonwealth Bank and Lend Lease.