Burson-Marsteller CEO resigns from Clinton campaign Mark Penn, CEO of Burson-Marsteller and trusted adviser to Sen. Hillary Clinton, takes on a client working to pass a trade treaty that Clinton has vowed to stop. What’s going on? By Bill SweetlandApril 9, 2008 SHARE 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.