Prime Minister Malcolm Turnbull says former South Australian premier John Bannon was working for Australia's future right up until his death on Sunday.
Mr Bannon died in hospital, aged 72, following a long illness.
"He was chairman of the expert advisory panel on reform of the federation and it was only on Thursday that we met to discuss those issues," Mr Turnbull said on Sunday night.
"He spoke with the wisdom of experience and the clarity and enthusiasm of someone totally committed to the issues of today and the challenges of tomorrow."
Mr Bannon led South Australia through "some of its toughest times", Mr Turnbull said.
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"Long years after his retirement from parliament, he continued to make a contribution to public service including as director of the ABC," he said.
"John was the Labor Party's longest serving state premier in South Australia. He was loved, admired and well-respected by all who worked with him."
