Sareff will work across the Sydney and Melbourne offices, overseeing strategic output and Ogilvy Australia's 20-strong strategy and planning team.
Most recently part of the Happy Soldiers team that won praise locally and overseas for its Virgin Money and highly-awarded Tontine campaigns, Sareff has also worked as national planning director at The Campaign Palace, and as a director at Prophecy Consulting.
“We’ve chased him down because he is the best guy in the business," said Ogilvy Australia’s executive chairman, Tom Moult. "I have challenged Mark to increase the ‘thinking culture’ across our whole business. I haven’t found any disagreement with clients when I tell them that I believe the agency of the future will be trading arms and legs for brains.”
Ogilvy Australia’s CEO Andrew Baxter said Sareff would also focus on leading an "already strong" team of thinkers across Ogilvy’s offices, with skills spanning digital, data, and more traditional areas within strategy and planning.
“Ogilvy’s strategic offering has grown significantly in the past four years, and we now have an incredibly strong team of thinkers that work right across a range of diverse fields,” Baxter explained.