Mary O'Sullivan

Mary O'Sullivan is a seasoned media and sustainability professional with over 25 years of experience leading commercial, PR, and marketing functions across the media industry. With deep operational insight and a passion for driving positive change, she has spent the past seven years supporting sustainably-led brands and initiatives, helping them navigate the complex intersection of media and environmental responsibility, whilst harnessing opportunities for their business. Mary has been working with the Ad Net Zero framework across Europe, guiding companies to identify meaningful sustainability opportunities while ensuring transparent and credible communication. Since 2023, she has led the Ad Net Zero initiative in Ireland and is now transitioning its rollout across Europe, working with companies and brands that are playing a pivotal role in aligning the media sector with global sustainability goals.