Margaret M. Witherup, Member

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  • I strive to provide the best possible legal representation, service and attention to each of my clients.

    Maggie focuses on helping clients solve regulatory and legal challenges.

410-576-4246 (fax)


Maggie is a member in the Firm’s Energy & Environmental, Litigation, Health Care and Government Relations Practices. She concentrates her practice in all aspects of environmental, health care, and administrative law, litigation and government relations.

Maggie has helped business and property owners, real estate developers, farmers, and environmental consultants find practical solutions to ordinary and complex environmental problems through negotiated settlements and/or litigation with responsible parties, governmental entities, and regulatory agencies. She has counseled landowners, prospective purchasers and potentially responsible parties regarding environmental site assessments, voluntary and government-ordered site remediation, Brownfields redevelopment, water allocation and appropriation issues, and Superfund sites. Maggie also has assisted clients with a variety of environmental compliance and enforcement issues, including Notices of Violation, air emissions and permitting, water appropriation and discharge permits, waste disposal, endangered species, stormwater management, Chesapeake Bay Critical Areas issues, and Certificates of Public Convenience and Necessity (CPCNs) for renewable energy facilities.

Maggie has represented clients as both plaintiffs and defendants in environmental contamination liability litigation involving a variety of contaminants, including chlorinated solvents, pesticides, metals, PCBs, and petroleum hydrocarbons.

In her health care practice, Maggie advises clients in the health care sector regarding compliance with licensing laws, Stark self-referral prohibition regulations, Maryland self-referral laws, the Federal Anti-Kickback Statute, and the Federal and Maryland False Claims Acts.  She has helped a variety of health care facilities obtain the licenses and approvals necessary to operate.

Maggie has advocated on behalf of clients in trial and appellate matters in Federal and State courts, as well as administrative agency proceedings including the Public Service Commission, the Office of Administrative Hearings, the Maryland Tax Court, and the Maryland State Board of Contract Appeals. In addition to the assertion and defense of environmental contamination liability claims, she has handled business tort and contract disputes, sales tax refund litigation, copyright infringement claims, and has represented a manufacturing client in significant multi-state litigation alleging negligent marketing, public nuisance, and product liability theories.

Prior to joining the Firm, Maggie was an Assistant Attorney General for the Maryland Port Administration. Among her responsibilities there, she advised the MPA on procurement matters which involved reviewing draft procurements for form and legal sufficiency, advising the client on how to structure procurements, and contract administration issues such as bid protests and contract claims. Maggie is also a former law clerk to the Honorable Arrie W. Davis on the Maryland Court of Special Appeals.

Maggie previously served as a Girl Scout Troop Leader for her daughter for 12 years and a Cub Scout Den Leader for her son for 5 years. When she is not practicing law, Maggie can occasionally be found performing in Bar Association Cabaret shows or local community theater.

Representative Matters

Represented Cecil County in connection with alleged stormwater violations at the County’s central landfill against the MDE.

Has extensive appellate experience including having argued cases in the Court of Special Appeals.

Successfully resolved other complicated environmental enforcement actions in lieu of litigation in many cases, demonstrating her ability to find creative solutions to difficult environmental problems.

As a former Assistant Attorney General for the Maryland Port Administration and a Staff Attorney in the OAG’s Civil Litigation Division, Maggie has worked closely with numerous government officials and agencies on a wide variety of matters. Maggie understands the unique constraints and issues facing government agencies, such as the Open Meetings Act and public information requirements.


AV Preeminent rating in Martindale-Hubbell®

The Daily Record's Leadership in Law Award, 2014

The Daily Record's Top 100 Women, 2008 and 2011

Named by Maryland Super Lawyers® for Environmental Law, Environmental Litigation and General Litigation since 2019 and as a "Rising Star" in 2009


Professional and Civic Involvement

Vice-Chair, Environment Committee, Maryland Building Industry Association

President, Professional Women in Building Council of Maryland

Member, American Bar Association, Environmental Litigation Committee; Founder and Co-Chair, Subcommittee of Women Environmental Litigators (2008 - present); Co-Chair, Membership Subcommittee (2007-2008); Co-Chair, Water Subcommittee (2006-2007); Co-Chair, Young Lawyer's Subcommittee (2005-2007)

Chair, Maryland State Bar Association, Environmental Law Section Council (2014-2015); Vice-Chair (2013-2014); Secretary/Treasurer (2012-2013)

Member, Baltimore City Bar Association

Member & Programs Committee, Commercial Real Estate Women (CREW)

Treasurer, Baltimore City Sitting Judges Committee (2010-2016)

Member, Board of Directors, Chesapeake Habitat for Humanity (2006-2014)

Member, Mission Committee, First & St. Stephen's United Church of Christ (2000-2012)

Troop Leader, Girl Scouts (2004-2017)

Den Leader, Cub Scouts (2009-2014)

Publications and Lectures

410-576-4246 (fax)



Related Legal Boutiques

Energy & Environmental
Government Relations
Health Care
Real Estate


J.D., with honors, American University Washington College of Law, 1994
B.A., with honors, Bucknell University, 1991

Court Admissions

U.S. Supreme Court
U.S. District Court for the District of Maryland
U.S. Court of Appeals for the Fourth Circuit

Bar Admissions

Maryland, 1994
Pennsylvania, 1995