Beveridge & Diamond
Mackenzie S. Schoonmaker photo

Mackenzie S. Schoonmaker


477 Madison Avenue
15th Floor
New York, NY 10022-5835
New York

  • State University of New York at Purchase (B.A., Environmental Science, magna cum laude, 2003)
  • Yale University (Master of Environmental Management, 2007)
  • Pace University School of Law (J.D., magna cum laude, 2007; Environmental Law Review)
Bar Admissions & Memberships
Bar Admissions & Memberships
  • District of Columbia
  • New York
  • U.S. District Courts: Southern District of New York; Eastern District of New York

Mackenzie Schoonmaker’s practice includes both environmental litigation and regulatory matters.  She helps clients nationwide navigate issues arising under the federal pesticides statute, FIFRA, the Clean Water Act, and related environmental laws. 

Under FIFRA, Ms. Schoonmaker represents pesticide companies in data compensation arbitrations, focusing on defending rights of data owners against follow-on registrants of pesticides.  She has also worked extensively with Task Forces comprising many national and multinational companies of all sizes that operate as joint ventures or limited liability companies to generate data and other information to meet government requirements under FIFRA. 

Ms. Schoonmaker counsels clients on a wide-range of issues arising under the Clean Water Act.  Most recently, she has assisted oil and gas companies with responses to Clean Water Act Section 308 information requests and Clean Water Act Section 404 compensatory mitigation requirements.  Ms. Schoonmaker’s practice also extends to defense of toxic tort claims against public utilities.  In 2011, she was part of a trial team which obtained a defense judgment after a three week trial on claims alleging the client supplied corrosive water to apartment buildings, Cormier v. D.C. WASA, 2011 D.C. Super. Lexis 7, 84 A.3d 492 (2013), which was successfully upheld on appeal.

Finally, Ms. Schoonmaker maintains an active pro bono practice.  For several years, she worked to facilitate a private, bipartisan panel’s publication of a report on conservation and outdoor recreation issues.  Her pro bono litigation matters include representing civil rights organization and individuals pursuing claims under the Fair Housing Act and representing a client in a partition action in the Superior Court of the District of Columbia.  Ms. Schoonmaker also serves as a founding member of the National Association of Women Lawyers Energy & Environmental Affinity Group, and she coordinates efforts to advance and retain the Firm’s women attorneys.

Ms. Schoonmaker began her legal career as an Associate in Beveridge & Diamond’s Washington, D.C. office from 2007 to 2011.  From 2011 to 2012, she worked as a Staff Attorney with Riverkeeper, Inc. where she focused on New York City watershed protection issues, including investigating and developing citizen suits and interfacing with state agencies to address water quality-related matters.  She rejoined Beveridge & Diamond in late 2012.

Super Lawyers recognized Ms. Schoonmaker as a “Rising Star” in its 2013-2017 editions.