mediasense onboards Sam Tomlinson as CEO
Sam Tomlinson succeeds Jamie Posnanski who has returned to the United States to focus on personal commitments
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Published: Jul 9, 2026 10:25 AM | 2 min read
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- Sam Tomlinson has been appointed as the new Chief Executive Officer of mediasense, effective immediately, succeeding Jamie Posnanski who has returned to the U.S. for personal commitments.
- Tomlinson joined mediasense in 2024 as Chief Client Officer after leading PwC's UK Marketing & Media advisory business, bringing over 25 years of experience in marketing advisory and transformation.
- Graham Brown, Founder & Director of mediasense, expressed confidence in Tomlinson's leadership abilities and acknowledged Posnanski's contributions to the company.
- In his new role, Tomlinson emphasized the importance of independent marketing advice amidst evolving industry challenges, including AI and accountability demands.
mediasense has appointed of Sam Tomlinson as Chief Executive Officer, succeeding Jamie Posnanski, who has returned to the United States to focus on personal commitments. The appointment takes effect immediately.
Tomlinson joined mediasense in 2024 as Chief Client Officer following the acquisition of PwC’s UK Marketing & Media advisory business, which he founded and led. With over 25 years’ experience advising senior marketers and major advertisers, he is recognised for his work across marketing advisory, governance and transformation.
Graham Brown, Founder & Director of mediasense, said: “When we welcomed Sam and his team into mediasense in 2024, we brought one of the industry’s most respected marketing advisory leaders into the business. Since then, he has had a clear impact on our clients, our people and our strategic direction. Sam brings strong commercial insight, deep client knowledge and a very clear view of where marketing is heading. The Board is confident he is the right person to lead mediasense and delighted he has agreed to take on this role. I would also like to thank Jamie Posnanski for his contribution to mediasense and wish him all the best for the future.”
Sam Tomlinson, Chief Executive Officer of mediasense, said, “Joining mediasense was an easy decision because of the quality of its people, clients and independent perspective. Over the past two years, I have seen first-hand the ambition of this business and the opportunity ahead. Marketing is entering a new era. AI, changing operating models and rising demand for accountability are reshaping how organisations plan for, make decisions and implement transformation. Marketers need clear, independent advice, now more than ever and mediasense is well placed to help them navigate that change. I’m honoured to lead the business built by Graham Brown, Andy Pearch, Greg Paull and Shufen Goh, and excited to work in partnership with Ryan Kangisser and the rest of the leadership team to continue building the industry’s most trusted independent marketing advisor.”
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