Aaron Lang


I enjoy assisting clients who are committed to environmental sustainability and promoting renewable energy.

Aaron Lang’s practice focuses primarily on environmental and energy law and covers a wide range of services, including litigation, regulatory proceedings, compliance, and environmental diligence in transactions.

A member of the firm’s Energy and Climate group, Aaron assists developers of renewable energy projects and related transmission facilities. He helps secure key permits for building utility-scale offshore wind facilities, conducts environmental diligence for solar energy projects, and represents energy industry clients in adjudicatory proceedings before state public utilities commissions in Massachusetts and New Hampshire.

Aaron also has extensive experience litigating and resolving complex environmental disputes, including under federal and state Superfund statutes, the federal Clean Air Act and multiple Massachusetts environmental laws, including laws and regulations governing sustainable coastline development. Aaron also helps clients on environmental due diligence and similar issues in real estate and corporate transactions.

Aaron draws on his litigation background, which has included representing clients in complex civil disputes in highly regulated industries. Aaron has helped litigate Medicare billing disputes under the False Claims Act and conduct internal investigations for healthcare and education clients.  Aaron also has significant trial experience from serving for four months as a special assistant district attorney for Norfolk County, where he conducted seventeen criminal trials before judges and juries.

Aaron maintains an active pro bono immigration practice, representing unaccompanied migrant children seeking lawful permanent residency in the United States. He has also represented an immigrant detainee in a habeas corpus proceeding in Massachusetts federal district court.

Before joining the firm, Aaron served as law clerk for Justice Gary E. Hicks of the New Hampshire Supreme Court.


  • Boston University School of Law, J.D., magna cum laude, 2015
  • University of Michigan, B.A., with distinction, 2011

Bar and Court Admissions

  • Massachusetts
  • New Hampshire


  • Spanish


  • Representing offshore wind energy developer in permitting and other proceedings before the Massachusetts Energy Facilities Siting Board and the Department of Public Utilities relating to two approximately 800MW offshore wind facilities
  • Advising solar developers in environmental diligence matters relating to the acquisition of solar projects
  • Represented a biomass generator before the New Hampshire Public Utilities Commission in proceedings related to an amendment to a power purchase agreement required by a change in state law
  • Representing client through appeal regarding Comprehensive Environmental Response, Compensation and Liability Act before Second Circuit Court of Appeals and related district court proceedings
  • Representing public and private clients in environmental contribution claims asserted under the Massachusetts Superfund statute, Chapter 21E
  • Representing PRPs and PRP groups in Superfund remedy negotiation and related litigation in Massachusetts and New Hampshire
  • Representing sovereign state client in damages phase of an investor-state arbitration in part of the proceedings that focus on environmental contamination
  • Represented public sector client in Clean Air Act dispute and with other environmental matters.
  • Represented a joint-venture in conducting environmental diligence for its acquisition of a corrugated cardboard manufacturer
  • Represented a major teaching hospital and physicians’ organization in qui tam action alleging improper billing of Medicare and Medicaid
  • Assisted in conducting internal investigation for a Boston-area medical center concerning the tragic death of a young woman who suffered a severe asthma attack outside the emergency department entrance
  • Assisted in conducting an internal investigation for a major Boston university into anonymous allegations of wrongdoing against a senior executive
  • Represented major insurer in successfully closing a complaint before the Centers of Medicare & Medicaid Services
  • Represented a witness in a bank investigation by the Office of the Currency Comptroller
  • Represents immigrants who have come to the United States as unaccompanied minors in change of status proceedings
  • Helped secure the release of an immigrant detainee in federal habeas proceeding that set precedent in the district court shifting the burden of proof in bond proceedings to the government to justify holding certain immigrant detainees
  • Represented Union of Concerned Scientists as amicus in district court challenge to President Trump’s executive order requiring repealing two regulations for every new regulation issued
  • Clerk to the Hon. Gary E. Hicks of the New Hampshire Supreme Court


  • Note, "An Opportunity for Change? Aggravated Felonies in Immigration Proceedings and the Effect of Moncrieffe v. Holder," 33 B.U. Int’l L.J. 523 (2015)

Honors & Involvement

  • The Best Lawyers in America: Ones to Watch
  • Editor-in-Chief, Boston University International Law Journal
  • Edward F. Hennessey Distinguished Scholar
  • Paul J. Liacos Distinguished Scholar
  • G. Joseph Tauro Scholar
  • James B. Angell Scholar
  • Boston Bar Association, Member