Assembly appoints Aaron Kleiman as General Manager and Client VP in Japan

Global omnichannel media agency Assembly has appointed Aaron Kleiman as General Manager and Client VP of its Japan operations. This strategic hire marks a significant move in Assembly’s North Asia expansion, deepening its presence to meet growing client demand and dynamic market shifts.

In his dual role, Kleiman will lead all aspects of the agency’s Japan operations, overseeing strategy, performance, and cross-functional team integration. He will also serve as a senior advisor to both local and global clients—delivering transformative, data-driven and tech-enabled marketing solutions specifically tailored for the Japanese market.

“Aaron is a seasoned leader with a rare combination of global vision and deep local expertise,” said Vivian Mok, Managing Director, North Asia, Assembly. “Japan remains a key growth market for Assembly, and Aaron’s track record of building high-performing teams and delivering world-class results for global brands gives us immense confidence in our future here.”

Kleiman brings over 25 years of experience in the Japanese market, across both agency and client-side leadership. Most recently, as Deputy Head of Initiative Japan, he spearheaded strategic growth for clients including AWS, LEGO, 3M, Finnair, Patek Philippe, and Hyatt. His unique ability to align global strategies with nuanced cultural insights—especially across travel, retail, and technology—makes him exceptionally qualified to lead Assembly’s expanding regional portfolio.

With a strategic mindset grounded in data, performance, and innovation, Kleiman is known for building integrated solutions that drive measurable growth. His leadership seamlessly blends deep technical fluency with sharp commercial acumen, empowering teams to connect brand, performance, and technology in ways that directly translate to business growth and client success.

“I’m thrilled to join Assembly and help lead its growth in one of the region’s most exciting and dynamic markets,” said Kleiman. “Assembly’s focus on data, technology, and building connected omnichannel experiences offers a powerful platform for brands looking to thrive amidst Japan’s continuously evolving consumer and business landscape. I’m excited to be part of the team.”

This appointment underscores Assembly’s ongoing commitment to investment across the APAC region, as the agency scales its footprint to meet the needs of today’s globally connected, yet locally nuanced, consumer landscape.