Rob Durie, who has been with the Australian Information Industry Association (AIIA) for 17 years, will leave the lobby group at the end of the year.
In a statement published by the AIIA on Monday, the chairman Peter Kazacos said that Durie told the organisation's board members last week that he would not be renewing his contract.
"Rob advised the board on Friday that he will not be renewing his contract when it expires at the end of this year... Rob indicated that after 17 years with AIIA he feels it's time for a new challenge," said Kazacos in a statement.
Kazacos praised Durie's achievements and assured members that he will not be cutting ties completely with the organisation.
"Rob has made such an important contribution, not only to AIIA, but to the industry more broadly... I am very pleased to have Rob's assurance that his experience and knowledge will continue to be available to the association in the future, to ensure our ongoing success," said Kazacos.
Durie joined the AIIA in 1989 and after spending several years in the deputy role, was appointed CEO in December 1999.