Omnicom Oceania Appoints Hamilton as Chief Marketing Officer

Omnicom Oceania has added two senior executives to its leadership team, promoting Kim Hamilton to Chief Marketing and Communications Officer and appointing Paige Prettyman to a newly created Chief of Staff role.

Both appointments expand the group's executive leadership team under CEO Nick Garrett, who was confirmed in the role on July 21, 2025.

Hamilton Expands Regional Remit From Australian Base

Hamilton's promotion builds on her previous role as Chief Marketing Officer at Omnicom Media Australia, where she established the organization's first centralized marketing and growth function.

PHD and OMD Australia Get New CEOs in Omnicom’s Regional Reboot

Omnicom splits PHD and OMD Australia leadership after consolidating Oceania operations. CMOs should watch how unified structures compete for share in Asia's booming digital ad market.

Mission MediaMission Media

In her expanded position, she will lead brand, profile, and communications across the full Oceania region, covering market positioning and strategic partnerships. She continues to work within Omnicom Media alongside her broader regional responsibilities.

Prior to moving into the CMO role in September 2024, Hamilton spent 11 years at OMD Sydney, during which the agency grew revenue by over 50%.

"I'm genuinely energised by the vision and transformation that Nick, KK, and the broader team are building together at Omnicom Oceania," Hamilton said. "We are building something genuinely different, more connected, more capable and better set up to help our clients navigate increasing complexity."

Prettyman Joins From Deloitte Digital in Newly Created Role

Prettyman's appointment as Chief of Staff fills a position that did not previously exist within Omnicom Oceania's structure. The role is focused on executive alignment and operational delivery across the business.

She joins from Deloitte Digital, where she served as Managing Director. She previously held senior leadership roles at Special Group Melbourne and Clemenger BBDO.

"What's really compelling about Omnicom Oceania is the opportunity to bring together creativity, media and advisory in a genuinely connected way and the impact that can have for clients," Prettyman said.

CEO Nick Garrett framed the appointments as consistent with the group's client-facing advice. "We talk a lot about helping our clients navigate transformation and elevating the role of marketing at an executive level. These appointments are about putting that into practice, building a business that is more connected, more focused on the customer, and set up to deliver real commercial impact," he said.

Appointments Follow Sequence of Leadership Changes at Omnicom Oceania

The Hamilton and Prettyman appointments are the latest in a series of executive changes at Omnicom Oceania. Garrett's CEO confirmation on July 21, 2025, was followed two days later by the announcement of Adrian Paul heading Omnicom Oceania operations.

Omnicom Names Ellen Griffin Global Brand President of OMD

Omnicom appoints Ellen Griffin as Global Brand President of OMD following its US$13B IPG acquisition. The move signals a major restructuring across six global media networks.

Mission MediaMission Media

The restructuring also follows Peter Horgan's departure as OMG ANZ CEO after 21 years and Kristiaan Kroon's appointment as Chief Operations Officer.

Omnicom Media Group Australia has held the top billing position among media agency groups in Australia for five consecutive years, according to RECMA and COMvergence data. Clients include Singapore Airlines, ANZ Bank, and the AFL.

The appointments come alongside Omnicom's full buyout of the Clemenger Group, one of Australia's largest creative networks, which is consolidating the group's Oceania assets under a unified operating structure. The full details of the Hamilton and Prettyman appointments were reported by Branding in Asia.