Peter Nash, a former chairman of KPMG Australia, has been appointed as a non-executive director of Westpac.The appointment consolidates a Melbourne takeover of the bank's board, which commenced following the ascension of Lindsay Maxsted as chairman in 2011.Under Maxsted, the Westpac board has also become a bolt-hole for ex-KPMG audit partners.Nash, Maxsted and former ANZ chief financial officer Peter Marriott all worked at the accounting firm.Marriott and another board member - former ANZ retail banking chief Peter Hawkins - also live in Melbourne.Former AMP chief executive, Craig Dunn, also hails from Melbourne but relocated to Sydney two decades ago. Nash is widely respected in the financial services industry, having cut his teeth in banking as the lead auditor for National Australia Bank in the 1990s.He managed KPMG's financial services practice at the peak of its influence at the turn of the millennium when the firm had audit mandates from NAB, ANZ and St George Bank.