Mr. Machen is Co-Chair of WilmerHale’s White Collar Defense and Investigations Practice and is also a member of the firm's global Management Committee. His practice focuses on government enforcement actions, corporate and congressional investigations, and litigating complex civil business disputes across the globe. An experienced litigator who has tried more than 35 cases to verdict, Mr. Machen routinely helps clients navigate high-stakes, crisis situations that garner the attention of multiple regulators, enforcement authorities, Congress and private litigants. Prior to rejoining the firm in 2015, Mr. Machen served for over five years as the United States Attorney for the District of Columbia. During his career, Mr. Machen has acquired substantial experience in both prosecuting and defending federal criminal and civil health care fraud matters and currently serves as a co-monitor to a major health care corporation.