Brownlee has over a decade of experience in digital publishing having worked with Handbag.com, Yahoo!, Channel 4 and more recently as a strategy advisor to a variety of publishers.
Former director Alex White stood down from her role after five years in the job in July.
"Ruth is a natural choice to be AOP’s new director. Her industry experience and breadth of online expertise are second to none, and she will take the association to the next level, in what is an exciting period of growth for online publishing across the board," said Simon Waldman, AOP chairman.
"I am immensely excited about the role and the opportunity to lead an organisation that has such an impressive set of publishers behind it. There is real ambition within AOP and that excites me," Ruth Brownlee added.
She will take up her new position at the end of January.
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