Former Reserve Bank of Australia governor Glenn Stevens is joining the boards of Macquarie Group and Macquarie Bank as the Millionaires Factory posted yet another record first-half profit.

Mr Stevens, who was governor of the RBA between 2006 and 2016, will become an independent director on both boards from November 1, Macquarie said in a statement to the ASX.

Former RBA Governor Glenn Stevens is joining the Millionaires Factory. Credit:Louie Douvis

He has been on a number of Australian and international boards and committees, including the Financial Stability Board, and on a range of G20 committees. As RBA boss, he led Australia's economy through the GFC, the mining boom and a record low interest rate environment.

Macquarie Group chairman Peter Warne said Mr Stevens "brings a unique perspective, not only regarding the drivers of Australia's economy, but also of the international economies from which Macquarie derives the majority of its income.