Assembly Appoints Jason Lim as first ever Chief Media Officer for North America

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Assembly (STGW) has appointed Jason Lim as its first-ever Chief Media Officer for North America, effective immediately. Based in New York City, Lim will report to North America CEO Jill Kelly and lead a team of over 350 channel experts across various media disciplines. With more than 20 years of agency leadership experience, most recently as Chief Planning Officer at EssenceMediacom, Lim will oversee media planning and investments across all channels and platforms.

In his role, Lim will be responsible for evolving Assembly's Experience & Activation practice, setting operational standards, driving innovation in media solutions, and delivering brand and performance campaigns. This appointment follows Assembly's recent achievements, including winning the Global Agency of Record for World of Hyatt and strategic appointments of Jill Kelly as North America CEO and Ilana Casser as EVP of Growth.

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NEW YORK, May 6, 2025 /PRNewswire/ -- Assembly, a leading global media agency, today announced the appointment of seasoned industry veteran Jason Lim as the agency's inaugural Chief Media Officer for North America. Based in the agency's New York City office, Lim will report to North America CEO, Jill Kelly.

In his new role, Lim will lead a team of 350+ channel experts across Search, Social, Programmatic, Video, SEO, Affiliate, CRM, OOH, Print, and more, overseeing the management of media planning and investments across all channels and platforms. He will also be responsible for evolving Assembly's award-winning Experience & Activation practice, setting operational standards, driving innovation in media solutions, and delivering breakthrough brand and performance campaigns for clients.

Lim brings more than 20 years of agency leadership experience to the position, most recently serving as Chief Planning Officer at EssenceMediacom. His appointment signals Assembly's continued investment in building best-in-class media expertise and progressive omnichannel activations.

"Jason is a rare leader who seamlessly blends data-driven, brand performance expertise with storytelling instincts," said Kelly. "In addition to being an elite practitioner, an incredible human with extraordinary professional wingspan, Jason is also a builder at his core–a shared Assembly gene."

Lim added, "I couldn't be more excited to join Assembly at a moment when the definition of media is rapidly expanding. This team's commitment to innovation, cultural fluency, and delivering measurable growth is what modern brands need. I look forward to working with our talented experts across North America to shape the future of media experiences and deliver real, lasting impact for our clients."

The announcement follows a wave of momentum for Assembly North America, coming on the heels of its recent Global Agency of Record win for World of Hyatt and the strategic appointments of Jill Kelly as North America CEO and Ilana Casser as EVP of Growth for the region.

Lim's appointment is effective immediately.

ABOUT ASSEMBLY 
Assembly is a leading global omnichannel media agency that merges data, talent, and technology to catalyze growth for the world's most esteemed brands. Our holistic approach weaves together compelling brand narratives with a comprehensive suite of global media capabilities, driving performance and fostering significant business expansion. Our initiatives are powered by STAGE, our proprietary operating system, and executed by a dedicated global team of over 2,300 professionals across 35 offices worldwide. Committed to purposeful action, Assembly leads the way in social and environmental impact within the agency realm. As a proud member of Stagwell (NASDAQ: STGW), the challenger network designed to revolutionize marketing, Assembly continues to set new standards of excellence. For more information, please visit assemblyglobal.com.

PR Contact
Mariana Delacqua
Mariana.Delacqua@assemblyglobal.com 

 

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SOURCE Assembly

FAQ

Who is Jason Lim and what is his new role at Assembly (STGW)?

Jason Lim is a seasoned industry veteran with 20+ years of agency leadership experience who has been appointed as Assembly's first-ever Chief Media Officer for North America, reporting to North America CEO Jill Kelly.

What will be Jason Lim's responsibilities at Assembly (STGW)?

Lim will lead a team of 350+ channel experts, oversee media planning and investments across all channels, evolve the Experience & Activation practice, set operational standards, drive innovation, and deliver brand and performance campaigns.

What was Jason Lim's previous position before joining Assembly?

Before joining Assembly, Jason Lim served as Chief Planning Officer at EssenceMediacom.

What recent achievements has Assembly (STGW) announced prior to this appointment?

Assembly recently won the Global Agency of Record for World of Hyatt and made strategic appointments of Jill Kelly as North America CEO and Ilana Casser as EVP of Growth for the region.