Media Super chief executive Ross Martin will leave his post with the $3 billion industry fund at the end of the year.
The decision to move comes after nine years with the fund.
Media Super chairman Gerard Noonan said Martin had done a great job during his tenure, guiding the fund through multiple licensing and legislative issues, as well as the Print Super/JUST Super merger.
"He will be leaving the fund in a great position for continued growth," Noonan said.
Martin said he was in search of new opportunities, having spent almost a decade with Media Super.
"Nine years is a long time to be chief executive. I need new challenges and the board needs new ideas. This is very much an amicable parting. I will miss the fantastic staff and the culture that is Media Super," he said.
The board is currently on the hunt for a replacement for Martin, who will stay on until 31 December 2012.
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