LONDON — Global marketing and media advisory firm Mediasense has officially announced the appointment of Sam Tomlinson as its new Chief Executive Officer. The appointment takes effect immediately.
Tomlinson succeeds Jamie Posnanski, who is stepping down from the role to return to the United States to focus on personal commitments.
1. Executive Succession and Leadership Framework
Tomlinson is an internal successor, having integrated deeply into the firm’s leadership structure over the past two years:
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Previous Role: Joined Mediasense in 2024 as Chief Client Officer.
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M&A Catalyst: He entered the company following Mediasense’s 2024 acquisition of PwC’s UK Marketing & Media advisory business—a highly respected specialized unit that Tomlinson originally founded and scaled.
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Industry Profile: Over a 25-year career, Tomlinson has established a major reputation as a premier industry authority on marketing governance, media transformation, and advertiser risk management.
2. Strategic Outlook: Navigating a New Era in Media
Tomlinson takes the helm during a transformative phase for the global advertising landscape, which is increasingly defined by data complexity and technological integration.
“Marketing is entering a new era,” Tomlinson noted upon his appointment. “AI, changing operating models, and rising demand for accountability are reshaping how organisations plan for, make decisions, and implement transformation.”
Graham Brown, Founder & Director of Mediasense, expressed absolute boardroom confidence in the transition, highlighting Tomlinson’s sharp commercial insight and deep client knowledge. Moving forward, Tomlinson will collaborate with Chief Strategy Officer Ryan Kangisser and the broader executive board to scale the company’s footprint as a leading independent marketing advisor, guiding global brands through complex AI integrations and operational restructurings.
