Brittain is a partner in the firm's White Collar Defense & Investigations group. Her practice focuses on representing clients in all types of government enforcement investigations, including matters involving complex financial fraud, securities fraud, market manipulation, public corruption and cross-border crimes.

With extensive experience as a prosecutor at the United States Department of Justice's Fraud Section, Brittain has led numerous high-profile investigations into various sophisticated fraud schemes. Her work encompasses matters involving accounting fraud, insider trading, commodities fraud, investment fraud, healthcare fraud, mail and wire fraud, tax fraud and money laundering, among others. Brittain has managed all aspects of large-scale criminal investigations, often in parallel with civil investigations by the U.S. Securities and Exchange Commission, the Commodity Futures Trading Commission or the Treasury Department. Her deep experience includes working closely with agents and officials from multiple U.S. law enforcement agencies and conducting cross-border investigations requiring frequent contacts with foreign criminal and civil regulators such as the United Kingdom's Serious Fraud Office and Financial Conduct Authority, the Netherlands Public Prosecution Service, the Ontario Securities Commission and the Australian Securities and Investments Commission.