Karen Green's practice concentrates on complex business litigation, including the defense of white-collar criminal and False Claims Act litigation. She has extensive experience representing companies in high-stakes government investigations and litigation alleging fraud, bribery, conspiracy and violations of federal statutes, including the Anti-kickback Statute, the Food Drug and Cosmetic Act, the Foreign Corrupt Practices Act, the Export Control Act and securities laws. At the request of corporate clients, she also has conducted numerous internal investigations of alleged wrongdoing and has advised their boards on compliance issues. Ms. Green has been selected as among the top investigations lawyers in the world, and has been consistently recognized by legal publications as a leader in litigation, including the defense of government and white collar criminal investigations and litigation. In 2014, she was selected as a 2015 Fellow of Harvard University's Advanced Leadership Initiative.
From 1993 to 1996, Ms. Green was the Deputy US Attorney for the federal District of Massachusetts. She supervised the investigation and prosecution of criminal cases and the litigation of civil cases on behalf of the United States. She also led the office's civil and criminal healthcare fraud enforcement program and served on the Department of Justice's National Health Care Fraud Working Group.
Ms. Green first joined legacy Hale and Dorr as a litigation associate in 1982. From 1984 through 1986, she served as an assistant US attorney in the Civil Division of the US Attorney's Office in Boston. She was appointed deputy chief of the Civil Division in June of 1986, and successfully obtained summary judgment on behalf of the EPA in a lawsuit compelling the cleanup of Boston Harbor. In January of 1987, Ms. Green returned to Hale and Dorr. She was elected to junior partnership in 1988, and to senior partnership in 1990. During the period from 2000 to 2007, Ms. Green served as vice chair and chair of Hale and Dorr's Litigation Department and as co-chair of WilmerHale's Litigation/Controversy Department. She also served as a member of the firm's Executive Committee.
In 1993, Massachusetts Governor William F. Weld appointed Ms. Green his chief of staff. She co-chaired governor-elect Weld's transition team for the Executive Office of Health and Human Services in late 1990 and early 1991.