All five holdco bosses on stage together at Mumbrella360
From left: Michael Rebelo, CEO of Publicis Groupe ANZ, Nick Garrett, CEO of Omnicom Oceania, Rose Herceg, president of WPP ANZ, James Wright, group CEO Havas ANZ and Rob Harvey, CEO of Dentsu ANZ
Five holding company CEOs, one stage and plenty of questions: Mumbrella360 will host the Australian bosses of Publicis Group, Omnicom, WPP, Havas and Dentsu when the global marketing summit returns in May.
Michael Rebelo, Nick Garrett, Rose Herceg, James Wright and Rob Harvey will take to the stage on the conference’s final day (28 May) to explore the evolving role of holding companies in an era defined by disruption, consolidation and technological acceleration.
Moderated by Rowena Millward, co-founder and CEO of MacMorgan, the session Disrupt, Consolidate, Accelerate: Who Wins Adland’s Big Reset? will unpack everything from the growing influence of AI to shifting client expectations and operating models, as the industry grapples with rapid change.
The session is among a new raft announced by Mumbrella today, including Share of Search or Share of Slop?
Led by Bill Page, senior marketing scientist at the Ehrenberg-Bass Institute, the session will unpack what we know about how brands grow, and what that means for today’s most talked-about (and often misunderstood) metrics.
It will explore what “share of” metrics actually tell marketers, where they fall apart, and whether newer concepts such as “share of model” represent useful evolution or overhyped noise.
Emelie Lundberg
Also on the program, Masterclass: How to Build an Anti-Burnout Content Model will explore how marketing teams can escape the cycle of constant ideation and production by building more sustainable content systems.
The session focuses on creating a repeatable content engine grounded in proven formats, audience signals and smarter reuse — prioritising long-term consistency over short-term bursts. It will also examine why repeatable formats outperform one-off executions, and how marketers can scale output without burning out.
Led by Emelie Lundberg, general manager, and Lucila Lannes, strategist at Bread Agency, the masterclass will offer practical frameworks for more sustainable content production.
Another newly revealed highlight, The MROI Index 2026, will see the launch of the latest iteration of the marketing effectiveness benchmark, offering a deep dive into channel performance, key trends and benchmarks across the Australian market.
Henry Innis and Nicky Barton of Mutinex will present the findings, sharing insights from one of the country’s leading marketing science teams, a must-see session with some of the top effectiveness minds in the country.
Taking place from 26–28 May 2026 at Carriageworks Sydney, this year’s Mumbrella360 will centre on the theme “Catalyst”, kicking off with a keynote from international speaker Thomas Barta, who will travel from Germany for the event.
Barta joins other marketing heavweights, including Mark Ritson, who will be discussing the collapse of core marketing skills and confidence; Bec Darley, group chief marketing officer of TPG Telecom; Lara Thom, global CMO of Guzman y Gomez; and Sweathead founder Mark Pollard, who will fly in from New York to unpack creative courage in the age of AI slop.
See the full list of speakers announced so far and get your tickets here.
