Momentum Group appoints Zac Stephenson as MD; Kate McDowell joins as group business director

Independent full-service media agency Momentum Group is entering 2025 with a bold leadership expansion to accelerate growth, drive innovation, and deliver exceptional client outcomes.

Seasoned industry leader Zac Stephenson (far right) has been appointed to the role of managing director, whilst Kate McDowell (far left) has been appointed to group business director.

Stephenson, a recognised powerhouse in New Zealand’s media industry, brings over 25 years of experience leading top agencies such as OMD, Ikon, and MediaCom/EssenceMediacom. Known for his ability to unlock growth, build high-performing teams, and redefine what’s possible for independent agencies, his appointment signals a new era for Momentum Group.

Says Stephenson: “I’ve long admired the rise (and rise) of NZ’s independent agencies, and the time has never been better to join this vibrant and flourishing community. To do so with someone as smart, dynamic, and fundamentally human as Natalia is a true privilege. I greatly look forward to helping Momentum deliver to its incredible growth potential.”

Momentum’s commitment to next-level client partnerships is reinforced by the appointment of McDowell as group business director. With an impressive track record spanning YoungShand, Publicis Groupe, and GroupM, McDowell is a results-driven strategist renowned for turning insights into growth. She will lead Momentum’s client service team, ensuring brands receive the highest level of strategic guidance, execution, and measurable success.

Says Natalia Taylor (centre), founder and CEO of Momentum Group: “In an industry where true leadership is rare, Kate stands out. She doesn’t just lead teams—she transforms and nurtures them. Her strategic mindset and ability to drive business impact make her a perfect fit for our ambitions in 2025 and beyond.”

As Momentum Group expands, the agency remains focused on delivering cutting-edge media solutions, data-driven insights, and transformative technology to drive exceptional client outcomes. In 2025, Momentum will strengthen its digital performance capabilities, evolve its strategic partnerships, and invest in AI-driven marketing technologies to stay ahead of the curve.

With Stephenson at the helm of operations and McDowell leading client service, the agency is poised for unprecedented growth.

Adds Taylor: “We’re building on our strong foundation to make 2025 our most ambitious year yet. With our leadership team in place, we’re doubling down on innovation, pushing boundaries, and setting new benchmarks for what independent agencies can achieve.”

As the agency enters this exciting new chapter, clients and partners can expect a relentless focus on performance, creativity, and strategic excellence.