Debbie Feinstein heads Arnold & Porter's Global Antitrust group, and brings a wealth of experience to her practice in advising clients on a range of antitrust challenges before US antitrust authorities. She recently re-joined the firm from the US Federal Trade Commission (FTC), where she was Director of the Bureau of Competition. In that capacity, she was responsible for supervising the investigation and enforcement of the US antitrust laws against anticompetitive mergers and conduct. During her tenure from 2013 to 2017, the FTC had substantial litigation success and a number of major merger wins, including challenges to Sysco Corp.'s acquisition of rival US Foods Inc., and Staples Inc.'s merger with Office Depot Inc. She had previously served at the FTC from 1989 to 1991 as Assistant to the Director of the Bureau of Competition and Attorney Advisor.