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Jillian C. Kirn focuses her practice on complex environmental and energy litigation, regulatory compliance counseling, and resolution of environmental liabilities identified in the course of transactions. She has wide-ranging experience representing clients in litigation in state and federal courts and routinely assists clients with risk management matters in the context of project redevelopments, renewable energy transactions, and the acquisition, sale, and financing of contaminated real estate. Jillian regularly counsels clients regarding environmental issues arising from innovative projects and the development and implementation of sustainability, ESG, and environmental, health, and safety management programs.

Prior to joining the firm, Jillian handled air, waste, and toxics enforcement matters in the U.S. Environmental Protection Agency’s Office of Regional Counsel in Seattle, Washington.



  • Completed 5-year term as assistant independent monitor under an EPA debarment agreement with a major energy producer.
  • Counselled government-owned electric power company on environmental risks, legacy liabilities, and natural disaster response, in the financial restructuring of a U.S. commonwealth.
  • Represented a New Jersey power plant in a unanimous decision upholding its NJPDES permit.
  • Member of the Defendants' Coordination Committee for the Aqueous Film-Forming Foams (AFFF) Products Liability multidistrict litigation pending before the U.S. District Court for the District of South Carolina.
  • Represent clients in a variety of industries, including electricity generation, in natural resources damages and contaminated sediment remediation matters.
  • Advise investor-owned energy companies on environmental matters arising in securities transactions related to large scale solar and wind projects in several Western states.
  • Represent clients in various industries, including midstream compression of natural gas, in wastewater, solid waste, and air permitting matters; administrative appeals; and enforcement actions.
  • Advise clients in matters involving environmental aspects of land use, such as wetlands regulation, erosion control, and brownfields.
  • Negotiate and manuscript site-specific and portfolio environmental insurance products, including pollution, legal liability, integrated risk and contractors pollution policies on behalf of developers and corporations.
  • Honors Attorney Fellow, U.S. Environmental Protection Agency, Region 10, 2011-2012

Reconocimientos y Liderazgo

  • Listed, Super Lawyers magazine, Pennsylvania Super Lawyers, "Rising Stars," 2017-2022
  • Listed, The Legal 500 United States, "Dispute Resolution - Product Liability, Mass Tort and Class Action - Defense: Toxic Tort," 2020 and 2022
    • "Other Key Lawyer," 2022
  • Listed, The Best Lawyers in America, "Ones to Watch," 2021-2023
    • Environmental Law, 2021-2023
    • Litigation - Environmental, 2022-2023
  • Selected, Euromoney, "Women in Business Law Awards Americas: Environmental Lawyer of the Year," 2021
  • Listed, Lawdragon 500, Leading U.S. Environmental & Energy Lawyers guide, 2021
  • Listed, Euromoney, Rising Stars, “Rising Star - Americas,” 2020
  • Listed, Law360, "Rising Stars," Environmental, 2020
  • Team Member, U.S. News - Best Lawyers®, Best Law Firms Edition, "Law Firm of the Year," Environmental Law, 2016
  • Secretary, John Bartram Association, Bartram’s Garden


  • J.D., Columbia Law School
    • Senior Editor, American Review of International Arbitration
    • Executive Editor, Ecology Law Quarterly
  • B.A., Haverford College
Con licencia para ejercer en
  • California
  • Colorado
  • Pennsylvania
  • U.S. District Court for the Eastern District of Pennsylvania
  • U.S. District Court for the Eastern District of Wisconsin
  • U.S. District Court for the District of Colorado
  • Español
  • Swedish