Mark is a Litigator in the firm’s national White Collar Defense, Government Investigations & Enforcement Practice and is among the leading lawyers in the United States when it comes to handling complex legal problems involving the government. He is a nationally recognized authority in government investigations and enforcement and cybersecurity defense, and a former deputy chief of the Criminal Division of the US Department of Justice (DOJ).

Mark represents, advises, and defends public and private sector clients in connection with internal investigations, regulatory enforcement actions, commercial litigation, and large-scale data breaches. He has represented CEOs, directors and officers, audit committees, and senior executives in industries as varied as health care, biotechnology, insurance, energy, automotive, media, sports and financial services.

Chambers USA lists Mark in Band 2 for white collar defense and government investigations, describing him as “a very well-connected and experienced practitioner who has the ability to put clients at ease.” He’s also described as “a strong strategic thinker who focuses on the best outcome for the company.” Clients praise his “unique skill set, which incorporates both the legal and the political realms,” as well as his proficiency in coordinating matters involving multijurisdictional and multiagency elements.

His background is a combination of senior legal, government, and private sector business experience, including six years as a trial lawyer and federal prosecutor conducting and supervising federal investigations nationwide. This includes two years as a deputy chief of the Criminal Division of the United States Department of Justice in Washington, DC; seven years as Chairman of the Board of Directors of the Massachusetts Port Authority, which runs Logan International Airport and the Seaport of Boston; two years as Secretary of Administration and Finance for the Commonwealth of Massachusetts; two years as Chief of Staff to the Governor of Massachusetts; and more than 20 years as a legal adviser, advocate, and litigator in disputes and proceedings throughout the United States. In 1992, he was nominated by the President of the United States to be the US Attorney for Massachusetts. Most recently, Mark served as counsel to the Transition Committee for incoming Massachusetts Governor Charlie Baker and Lieutenant Governor Karyn Polito.

Mark’s background and experience have earned him recognition among the top lawyers in the United States for complex crisis matters involving securities fraud, health care, insurance, antitrust, banking, data breach, environmental enforcement matters, procurement fraud, false claims, corruption (including Foreign Corrupt Practices Act), commercial bribery, export control and espionage, financial and accounting misconduct, RICO, internal investigations, risk assessments, and regulatory compliance problems. He also represents and defends his clients in federal and state court commercial and business litigation, class action proceedings, multistate disputes and investigations, regulatory enforcement matters, and congressional and legislative hearings, as well as in responding to whistleblower allegations.