People

President & CEO of MNTN, Mark Douglas is a veteran AdTech operator who co-founded SteelHouse and has spent decades building performance-driven advertising technology businesses that champion transparency and advertiser-friendly innovation.

Mark Elwood is a senior creative strategist at Leo Burnett UK, known for blending data-driven insights with compelling brand storytelling in the evolving media and advertising landscape.

SVP & GM of PayPal Ads, Mark Grether is a serial ad platform builder who scaled YouTube's ad business past $30B and built Uber Advertising from scratch into a major retail media force.

SVP, Platform at Applecart; former Head of Product, Moat (Oracle Advertising).

CEO of Omnicom Branding, overseeing a powerhouse portfolio of global brand consultancies including Interbrand, Siegel+Gale, Wolff Olins, and Sterling Brands.

Founder and CEO of Stagwell, the data-driven challenger to legacy holding companies, who brought political micro-targeting and polling methodologies to modern brand marketing and AdTech.

Chair of Fifty5Blue and former CEO of WPP (2018–2025); ex-Wunderman CEO and WPP Digital founder.

CEO of DoubleVerify who led the company's 2021 NYSE IPO and has become one of AdTech's most prominent voices on brand safety, ad fraud prevention, and digital media quality.

CEO & Founder of JuiceMedia.AI, Mark Zamuner is building AI-driven media and advertising solutions, drawing on deep programmatic expertise and prior product leadership at Google.

CEO and co-founder of Meta, architect of the world's largest social advertising ecosystem generating over $130B annually in ad revenue.

Veteran advertising industry leader who helmed the 4A's for eight years and now brings C-suite and trade-organization expertise to board and advisory roles across the AdTech ecosystem.

Head of Programmatic & Ad Operations at Ringier AG, driving yield strategy and identity solutions across a major multi-market European publisher portfolio.

Martha Stewart is a lifestyle media mogul and brand empire builder whose content, commerce, and media strategies have influenced how brands think about audience trust, content marketing, and direct consumer relationships.

AdTech operator and industry veteran now driving UK growth at AudienceProject, with a career spanning publisher monetisation, audience measurement, and the post-cookie transition at organisations including the Ozone Project and Ebiquity.

Sir Martin Sorrell is the founder and Executive Chairman of S4 Capital, and the architect of WPP's rise to become the world's largest advertising holding company — one of the most consequential figures in the history of global advertising.

Author of 'House of Lies' (adapted into a Showtime series) turned AdTech strategist; a leading industry voice on customer data platforms and post-cookie identity, formerly a Distinguished Analyst at Gartner.

Founder of aimClear and pioneer of psychographic targeting in paid social, Marty Weintraub is one of AdTech's most influential voices on advanced audience research and social media advertising strategy.

CEO of Axel Springer SE, one of Europe's largest digital publishing and media empires, who has shaped the intersection of journalism, digital advertising, and media M&A at a continental scale.

CEO and co-founder of ID5, the programmatic ecosystem's leading shared identity infrastructure provider, pioneering privacy-compliant alternatives to third-party cookies at scale.

Chief Commercial Officer at Nova Studio; veteran ad-tech sales and partnerships leader (ex-Index Exchange, AdColony, Zeotap).