Doyle's move to the UK marks the latest turn of the merry-go-round, having previously been Director of Audi in Ireland from 2011 to 2013, and general manager of sales at Audi Australia between 2005 and 2010. Doyle, an Australian citizen, has also worked with the BMW Group in Australia and Canada.
In something of a quasi exchange program, O'Brien comes to Audi Australia from the UK, where he currently works as the company's director of sales. He has previously worked with fellow Volkswagen Group brand Seat in his homeland of Ireland, and before that with Audi Ireland.
Above: the all-new Audi Q5, revealed earlier this month
Doyle will leave for the UK at the end of March next year, with O'Brien to step into the role of managing director for Audi Australia in April.
Doyle's move can be considered a promotion, with Audi's UK arm having sold over 47,000 cars in the first quarter of 2016 alone, against a year-to-date September-end Australian figure of 18,175 sales.
Last year was Audi Australia's 11th consecutive year of growth, with just over 23,000 sales. Fellow German marque BMW was just ahead with 25,022 sales, while Mercedes-Benz - whose business includes a range of commercial vehicles - achieved 36,374 sales.