Mr Fox, who stepped down from the chief executive role at the association in March after four years in the job, will join the board as Stanford Brown looks to expand its footprint beyond NSW.
In a statement, Stanford Brown chairman David Brown pointed to Mr Fox's leadership skills and industry knowledge.
“I am delighted to welcome Brad to Stanford Brown," Mr Brown said. "During his four-year tenure as CEO of the AFA, he showed real courage and leadership. Brad’s appointment is the first stage of our longer-term strategy of creating an independent and diversified board. I admire Brad’s character, work ethic and strategic thinking, which will add significant value to our organisation.”
Describing Stanford Brown as one of the country's "elite" firms, Mr Fox said he anticipated bringing a new perspective to the board.
"We share a passion to improve the lives of Australians through the highest quality, non-conflicted advice delivered with uncompromising standards of client experience," Mr Fox said. "I look forward to bringing another dimension to their strategic thinking and expansion plans."
The former association chief ceased his consulting role at the AFA effective 30 June so he can commence his board director duties.