The Australian Prudential Regulation Authority has completed an overhaul of its executive ranks after luring widely-respected risk expert Sean Carmody from Westpac.Carmody has been appointed to the newly created role of executive general manager of risk and data analytics at the regulator.APRA has now filled all senior vacancies in its organisational revamp, paving the way for an internal candidate to replace chairman Wayne Byres whose five-year term ends in July 2019.The regulator has also elevated chief risk officer Ben Gully to the role of executive general manager of specialised financial institutions.Gully is an internationally respected bank superviser who worked for 15 years at Canada's prudential regulator before he joined APRA in July 2015.He is viewed by many in the local banking industry as a potential successor to Byres, having led the supervision of Canada's largest banks during the Global Financial Crisis.Gully's international experience is deep - early in his career he worked at the Bank of England's financial stability division.His LinkedIn profile includes a string of glowing endorsements from leading international regulators such as Lascelle Cummings, the managing director of Canada's Office of Superintendent of Financial Institutions and Arvind Baghel, the head of supervision at the Dubai Financial Services Authority.The APRA role is Carmody's first working for a regulator, but his industry experience is wide-ranging.He joined Westpac in November 2001 as head of market risk and later managed the transformation of the bank's operational capital framework. In 2010 he was responsible for Westpac's retail, corporate and structured credit operations as head of credit risk.He has also held leadership roles at Barclays Global Investors and Deutsche Bank.In 1995 Carmody completed a PhD in pure mathematics at Cambridge University.