Media Relations PR firms vow not to partner with climate change deniers Agencies including Weber Shandwick, Waggener Edstrom Worldwide, and WPP, the parent company of Ogilvy and Burson Marsteller, have made the bold step. By Matt WilsonAug. 6, 2014 SHARE Ragan Insider Premium Content To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.