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István Székelyhidi is currently the Head of Ad Operations at WPP Media, a position held since 2025. Previously, they served as the Head of Ad Operations at GroupM and were a Senior Campaign Manager at Origo Zrt. from 2009 to 2014. István has also held the role of Senior Ad Ops Manager at Fastbridge and was the Team Leader of Campaign Management at Wavemaker Hungary and Wavemaker from 2016 to 2024.