Paul helps clients navigate increasingly complex environmental requirements governing global supply chains and products across their life-cycle.

He works with leading companies to anticipate and comply with product-related environmental requirements in the U.S. and in key markets worldwide. He has represented U.S. business interests in the negotiation and implementation of regional and global environmental agreements that drive national legislation and the circular economy.

Extended Producer Responsibility (EPR) 

Paul advises companies on compliance with expanding EPR laws governing the management of used and end-of-life electronic equipment, batteries, medical devices, unwanted pharmaceuticals, and other regulated products in the U.S. and in other countries. He has advised clients on the successful launch of regional and global take-back programs.

Basel Convention and Circular Economy

Paul serves as a strategic advisor to companies on new circular economy initiatives with a focus on reuse of products, waste classifications, and logistics. He regularly advises on requirements governing transboundary shipments of electronic products for reuse, repair, and recycling. For more than two decades, he has represented clients in the electronics sector on the negotiation and implementation of international controls and trade bans arising under the Basel Convention, a global agreement governing the transboundary movement of wastes and recyclables.

Market Access Legislation

Paul provides actionable compliance advice on market access requirements for products subject to RoHS measures and material ban legislation, energy efficiency mandates, and product design requirements.

Responsible Sourcing

Paul also advises a diverse group of companies on due diligence, supply chain communication, and disclosure requirements related to the responsible sourcing of timber, conflict minerals, and other raw materials.

Conservation Leadership

Paul is active with many of the country’s leading conservation organizations. He serves on the board of the Conservation Fund which since its founding has protected over 8 million acres of natural lands and working landscapes. He is a former board chair of the Environmental Law Institute and Chesapeake Conservancy. He has also served on the boards of the American Bird Conservancy and World Environment Center. He has advised non-profit clients on the protection of whales, the establishment of nature reserves in South America, global protections for albatrosses and other seabirds, and sustainable fisheries management.


  • Providence College  (B.A., 1986)
  • American University  (J.D., 1990)

Bar Admissions

  • District of Columbia
  • Maryland

Professional Affiliations

  • U.S. Council for International Business (USCIB) Environmental Committee, Co-Chair
  • The Environmental Forum (ELI) Advisory Board
  • American Society of International Law (ASIL)
  • NatureServe, Advisor
  • Washington College of Law at American University (Washington, DC; Geneva, Switzerland), former adjunct professor

Honors & Awards

  • The Best Lawyers in America®, a Best Lawyers publication, Environmental "Lawyer of the Year" in Washington, DC (2019)
  • The Best Lawyers in America®, a Best Lawyers publication, recognition in Environmental Law (2013-2020)
  • Chambers and Partners - USA, ranked Band 3 in Environmental Law (2016-2019)
  • Who's Who Legal, part of Law Business Research Ltd., recognition in Environmental Law (2016-2019)
  • Super Lawyers, part of Thomson Reuters, Washington, DC, Super Lawyer (2009-2019)
  • The Legal 500, recognition in Environmental Law (2013)


For more recent publications since 2015, see the Publications tab. Paul's bibliography prior to 2015 includes:

  • "The Expanding Regulation of Used and End-of-Life Electronic Products," Paul Hagen and Ryan Carra, ABA Trends, September/October, 2014
  • "Federal Interagency Task Force Announces National Strategy for Electronics Stewardship," Paul Hagen and Jennifer Abdella, The Environmental Counselor, August 2011
  • "The Global Expansion Of Toy Legislation," Paul Hagen and Erica Zilioli, Law360, 2010
  • "It’s Past Time to Ratify the Basel Convention," Essay in “Turning Trash into Treasure: Regulating E-Waste Exports," Paul Hagen, The Environmental Forum, v27, i6, 2010
  • "The End of the Environmental Profession (In the Year 2049: What Will Environmental Protection Be Like 40 Years From Now?)," Paul Hagen, Environmental Law Institute, v26, i6, 2009
  • "The Stockholm Convention on Persistent Organic Pollutants," Paul Hagen and Michael Walls, Natural Resources & Environment, v19, i4, 2005
  • "Product-based Environmental Regulations: Europe Sets the Pace," Paul Hagen, Trends: ABA Selection of Environmental, Energy, and Resources Newsletter, v37, n.3, 2005
  • "An Introduction to the Rules of the WTO: An Environmental, Health, and Safety Perspective," Paul Hagen and John Barlow Weiner, chapter in Trade and Environment, The WTO, and MEAs: Facets of a Complex Relationship, 2001
  • "The Cartagena Protocol on Biosafety: New Rules for International Trade in Living Modified Organisms," Paul Hagen and John Barlow Weiner, The Georgetown International Environmental Law Review, v12, i3, 2000
  • "The Green Diplomacy Gap," Paul Hagen, The Environmental Forum, v17, i4, 2000
  • "The Basel Convention," Paul Hagen and Robert Housman, chapter in The Use of Trade Measures in Select Multilateral Environmental Agreements, UNEP 1995
  • "The Convergence of Trade and Environmental Law," Alan Charles Raul and Paul Hagen, Natural Resources & Environment, Fall 1993
  • "The Application of the United States Hazardous Waste Cleanup Laws in the Canada-U.S. Context (The Law and Economics of Environmental Regulation in the Canada/U.S. Context)," John Hanson, Paul Hagen, and Kathleen Rogers, Canada-United States Law Journal, 1992
  • "The International Community Confronts Plastics Pollution from Ships: MARPOL Annex V and the Problem that Won't Go Away," Paul Hagen, The American University Journal of International Law and Policy, v5, i2, 1990