Mark Medish, who was a senior staff member of the National Security Council during President Clinton’s tenure, has joined APCO Worldwide to lead the firm’s Global Political Strategies service and serve as EVP of the firm.

In addition to his service under President Clinton, Medish also served as deputy assistant secretary of the Treasury for international affairs under Laurence Summers and Robert Rubin. Most recently, he was VP of the policy think tank the Carnegie Endowment for International Peace.