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Assembly, the global media agency within the Stagwell network, announced today that industry trailblazer and Europe CEO Matt Adams has been elevated to global chief operating officer. Media veteran and Europe chief of staff Clare Chapman has been promoted to Europe CEO. Matt and Clare report to global CEO Rick Acampora and their appointments are effective immediately.

Matt brings a wealth of experience to his new position, having served as CEO of Assembly Europe since 2023. Under his leadership, the agency has experienced remarkable growth across key markets, cementing its reputation as a leader in delivering integrated, high-impact solutions tailored to the complexities of regional and global audiences. As Assembly Europe CEO, Matt expanded media operations into Poland, integrating Brand New Galaxy under the Assembly umbrella as Assembly Digital Commerce, and secured marquee clients such as Estée Lauder Companies and Pipedrive. Additionally, Matt played a key role in attaining B Corp certification in Europe, reinforcing Assembly’s commitment to social and environmental responsibility.

With a career spanning more than two decades, Matt is regarded for combining operational rigor with a deep understanding of client needs and market dynamics. Beyond operations, Matt’s remit as global COO includes commercial leadership, building a global community focused on changing the assumed industry narratives and bringing agency remuneration much closer to client business growth. He will also oversee Assembly’s global media partnerships, fostering relationships that support regional client innovation and leadership across core offerings such as cloud, brand and performance media and data, ensuring the agency remains at the forefront of media excellence. Further, Matt will continue to oversee Assembly’s Global Delivery offering, which includes more than 1,000 experts across India, Egypt, and the Philippines.

“Matt has been a driving force behind Assembly’s European success, and his leadership is pivotal to our global growth trajectory," said Rick Acampora, global CEO of Assembly. “His promotion to global COO is a testament to his ability to inspire teams, lead with vision, and deliver results. We are excited to see the global impact of his leadership.”

Matt added, “I’m honoured to step into the global COO role at such an exciting time for Assembly. Our teams around the world are doing extraordinary work, and I’m eager to help elevate our operational excellence and create even greater opportunities for innovation, collaboration, and growth.”

Based in London, Clare steps into her role with a clear focus: accelerating growth, deepening client partnerships, and driving meaningful impact across Europe and the UK. She takes on responsibility for Assembly Europe’s product, client services, new business, marketing, activation, people, and consultancy teams—bringing these functions together to create seamless, strategic solutions for brands. With all of Matt’s direct reports under her leadership, she is dedicated to continuing to scale Assembly’s presence in the region and making it an indispensable partner in an evolving media landscape.

A two-time agency CEO with more than 25 years in media, Clare has a proven track record of securing major business wins and leading integrated teams to deliver real results. She’s held leadership roles at Maxus, Essence, and Carat, where she helped brands navigate complexity and unlock growth. Known for her direct, decisive, and empathetic leadership style, she is committed to fostering a culture where teams thrive, innovation flourishes, and clients gain a competitive edge.

“I’m incredibly excited to join Assembly at such a pivotal time,” said Clare. “The agency’s momentum in Europe is undeniable, and I look forward to working with our talented teams to build on this success, drive innovation, and create real impact for our clients.”

Rick added, “Clare is a phenomenal leader with the experience, vision, and energy to propel Assembly Europe forward. I have no doubt that she will take the agency to even greater heights, and I look forward to seeing her impact in this next chapter.”