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Matthew K. Tieslau focuses his practice on environmental compliance, water law, and brewery representation.

Matt counsels clients on a range of natural resources and environmental matters, including litigation, permitting, auditing, reporting, enforcement, agency negotiations, and title board actions. His clients have included industrial actors, municipalities, mines, property owners, and ranchers.

Matt advises on water law matters related to water applications covering senior and junior rights, as well as exchanges and expansions, historical use quantification, and issues of state versus federal law. He also provides counsel on remediation and other water quality issues.

Matt also advises brewery clients on start-up issues including fundraising and local, state, and federal licensing, ongoing compliance, and day-to-day operations.


  • Environmental compliance: auditing, enforcement, permitting, reporting.
  • Mining
  • Right-of-access
  • Election law in the environmental context
  • Brewery representation



  • Representation of oil and gas interests in Colorado Supreme Court case determining the statutory authority of the Colorado Air Quality Control Commission to issue oil and gas drilling permits under the Colorado Oil and Gas Conservation Act.
  • Representation of parties regarding CWA and RCRA compliance issues.°
  • Representation of parties in USFS negotiations regarding remediation and right-of-access.°
  • Representation of parties in water applications covering senior and junior rights.°
  • Represented brewery startups in licensing, real estate transactions, regulatory compliance, and contract review.°

°The above representations were handled by Mr. Tieslau prior to his joining Greenberg Traurig, LLP.

  • Fellow, Colorado Office of the Attorney General, 2014-2015
  • Extern, Colorado Office of the Attorney General: Natural Resources & Environment Section, 2014
  • Intern, Denver Water, 2013
  • Intern, Colorado Public Utilities Commission: Policy, Research and Emerging Issues Group, 2013

Recognition & Leadership

  • Team Member, a Law360 “Environmental Practice Group of the Year, 2022
  • Listed, The Best Lawyers in America
    • "Ones to Watch," Litigation - Environmental, 2023-2024
    • "Ones to Watch," Natural Resources Law, 2023-2024
    • "Ones to Watch," Environmental Law, 2024
  • Listed, Super Lawyers magazine, Colorado Super Lawyers, "Rising Stars," 2023
  • Member, Colorado Bar Association
    • Member, Environmental Law Section
    • Member, Natural Resources & Energy Law Section
    • Member, Water Law Section
  • Member, Brewers Association
  • Member, American Homebrewers Association
  • Member, Faculty of Federal Advocates


  • J.D., University of Colorado Law School, 2014
    • Managing Editor, Colorado Natural Resources, Energy, & Environmental Law Review
  • B.S., Environmental Health, University of Georgia College of Public Health, 2010
    • Member, Epsilon Nu Eta Environmental Health Honor Society
  • Colorado