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  • Clients report Gilligan “explains complex legal situations in clear ways and makes excellent recommendations for solving our problems.” - Chambers USA

    Leigh Gilligan of McCarter & English, LLP “displays a perfect blend of commanding legal knowledge and creative business know-how,” clients say. - Chambers USA

  • Martindale-Hubbell AV Preeminent Rated
    5.0 out of 5


  • J.D., George Washington University Law School, 1990 (formerly George Washington University, The National Law Center)
  • B.A., University of Vermont, 1987

Bar Admissions

  • Massachusetts

Court Admissions

  • U.S. District Court, District of Massachusetts
  • U.S. Court of Appeals, First Circuit

Memberships & Affiliations

American Bar Association, Section of Natural Resources, Energy and Environmental Law

Boston Bar Association, Environmental Law Section

New England Women in Real Estate (NEWIRE), Member of the Steering Committee (2004 - 2007), Programs and Seminars Committee

Commissioner, Newton (MA) Conservation Commission


Chambers USA "Leaders in their Field" for 2010-2016

Massachusetts Super Lawyer for 2004-2018

2007 Professional Service Award by New England Women In Real Estate

Leigh A. Gilligan

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  • T: 617.449.6520
    F: 617.326.3116

Ms. Gilligan is a partner in the firm's Environment & Energy Practice Group. She has extensive experience in many aspects of environmental and land use law including licensing and permitting, compliance counseling, and representation in connection with business and lending transactions, as well as real estate development.

Ms. Gilligan represents parties involved in federal and state hazardous waste sites including legal proceedings, private cost recovery actions and dealings with governmental agencies. She regularly represents lenders in the evaluation, management and resolution of environmental issues. She also has extensive experience in environmental issues involved in transactions for the purchase and sale of land and businesses, including confirming and securing liability protections and economic incentives in connection with Brownfields redevelopment. Her representation also includes preparation of environmental opinions in connection with loans and bond issuances; compliance counseling to businesses of all sizes; representation of parties in environmentally-related state and local administrative and enforcement proceedings (including wetlands, tidelands and Massachusetts Environmental Policy Act review and facility site assignments); and working with site owners and developers in the management of environmental issues and permitting in the context of development. Ms. Gilligan is a frequent author and lecturer on environmentally related topics. She has in the past been an Instructor/Guest Lecturer at MIT's Center for Real Estate.

The "very helpful and responsive" Leigh Gilligan has a solid and broad-ranging environment and land use practice and she leads the team's Boston offering. Ms. Gilligan is recognized in Massachusetts Super Lawyers for 2004-2018, and is listed in Chambers USA from 2010-2019. Her broad practice includes the representation of clients in compliance, licensing and permitting matters. Chambers is published by Chambers and Partners. Super Lawyers is published by Thomson Reuters. A description of their selection process can be found in the respective links above. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.

Representative Matters

Urban Educational Institution
Representation of major urban educational institution in connection with multiple environmental matters including site remediation, permitting, development and transactional support with respect to environmental issues.
Consortium of Massachusetts Colleges and Universities
Representation of consortium of major colleges and universities in Massachusetts to locate, permit, develop and operate a state-of-the-art high performance data center in Western Massachusetts
Major Transit Authority
Representation of major transit authority in connection with environmental compliance and land use matters. Significant examples include (i) negotiation with environmental regulatory agencies with respect to alleged violations, including resolutions via negotiated consent agreements; (ii) coordination with Real Estate Group attorneys to represent the transit authority in connection with major air-rights/terra firma development project located in highly desirable area of Boston; and (iii) representation in connection with environmental matters alleged by abutters to client-owned properties throughout Commonwealth.
National Real Estate Investment Corporation
Representation of a national real estate investment corporation in connection with environmental matters in the context of review of potential acquisitions and investment opportunities. Related assistance in evaluation and management of associated risks and negotiated documentation of same.


Environmental Liabilities – Who is Exposed?
McCarter & English New York Office
New Jersey's Licensed Site Professional Program
New Jersey Site Remediation Reform Act, A.2962 Webinar
Environmental Issues in Construction
Gadsby Hannah LLP, Boston, MA
01/97, 02/99,02/00
Doing Deals
MCLE Seminars