Matt Warner is an experienced regulatory, political and constitutional lawyer who focuses his practice on the intersection of law, politics and public policy. He’s in his comfort zone helping clients navigate difficult and high-profile issues including the direction of the country’s legal cannabis industry, efforts to ensure widespread ballot access and free elections, and the future of hydropower and Maine’s renewable energy resources.

Equally at home arguing constitutional law in a court of appeals or negotiating with top political leaders, Matt’s practice extends nationwide. He has helped clients in more than a dozen states with legal problems ranging from state agencies that improperly deny a license, to state laws that are unconstitutional, to sticky regulatory issues, and even contract disputes. Matt has also been recognized by Law360 as one of the country’s top lawyers in the field of cannabis, after pioneering a series of successful constitutional challenges to state marijuana laws. 

Matt also helps clients coordinate political campaigns to influence regulators and policymakers. Drawing on his broad experience as a speechwriter and on political campaigns, Matt enjoys working with clients on everything from messaging and communications to building coalitions and developing facts that can be used to move public opinion.

A native of Holden, Maine, Matt is an enthusiastic mountain biker and ice climber and regularly participates in ultra-endurance races. He lives in Cumberland with his wife and two young sons, both of whom are already better climbers than he is.

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