Matthew S. Warner is a partner in Preti Flaherty's Litigation, Government Affairs, and Cannabis Business groups, practicing from the firm's Portland office.

Matt has a wide-ranging practice, which includes commercial litigation, land use planning, and administrative law. He is an experienced trial lawyer, with success in both state and federal court, as well as before numerous state agencies and boards. He is counsel to a number of Maine-based businesses, advising companies on an extensive array of matters, including entities in the cannabis industry on regulatory, compliance, and licensing issues. Matt also helps clients navigate the political process in Augusta.

Prior to joining Preti Flaherty in 2013, Matt worked in government and public affairs. A former speechwriter and grassroots advocate for more than a decade, Matt worked at the White House and the U.S. Department of State.

Matt has a B.A. from Boston University, a J.D. from Columbia Law School, and an LL.M. from the London School of Economics and Political Science, where he specialized in international law, and is a former adjunct professor at University of Maine School of Law.

A native of Holden, Maine, Matt is an avid backcountry skier, regularly participates in mountain bike endurance races, and serves as president of the Greater Portland Chapter of the New England Mountain Bike Association. Matt lives in Cumberland with his wife and two sons.

Professional Activities

  • Maine State Bar Association
  • Adjunct Professor, University of Maine School of Law
  • Board of Directors, New England Mountain Bike Association - Southern Maine Chapter

Honors & Recognition

  • Recognized as a Super Lawyers New England Rising Star in the area of general litigation
  • Law360 MVP of the Year in Cannabis, 2021
  • Benchmark Litigation "40 & Under List," 2022-Present