Mary W. Koks



700 Milam Street
Suite 2700
Houston, TX 77002-2806

O: 713.222.1470
D: 713.222.4030

Mary is a Shareholder in the Houston office of Munsch Hardt, who joined the firm in 2005. Mary has more than 36 years of experience in the environmental arena, focusing on environmental litigation, enforcement, remediation, compliance, counseling, transactional and permitting matters.

Her experience includes:

  • Representation of potentially responsible parties and landowners in environmental lawsuits including bankruptcy matters, toxic tort, property claims and suits brought under various environmental acts including Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), Resource Conservation and Recovery Act (RCRA), Oil Pollution Act (OPA), Clean Water Act (CWA), Clean Air Act (CAA) and comparable state statutes.

  • Representation of clients in administrative and civil enforcement cases before the Environmental Protection Agency (EPA), Texas Commission on Environmental Quality (TCEQ) and State Office of Administrative Hearings (SOAH).

  • Assisting and advising clients on environmental issues in real estate related transactions, corporate acquisitions and mergers, insurance claims as well as regulatory compliance, supervision of environmental compliance audits and the Spill Prevention Control and Countermeasures (SPCC) plans.


  • Master of Arts in Government from University of South Carolina
  • Master of Law in Energy, Environment, and Natural Resources Law from University of Houston Law Center
  • Bachelor of Arts in Political Science from University of South Carolina
  • Juris Doctor from South Texas College of Law


  • AV® Preeminent™ Peer Review Rated, Martindale-Hubbell
  • Best Lawyers in America "Lawyer of the Year", Woodward/White, Inc., 2017
  • Best Lawyers in America in Environmental Law, Woodward/White, Inc., 2007-2013, 2017
  • Best Lawyers in America, Texas' Best Lawyers, Woodward/White, Inc., 2013-2016
  • Environmental Super Lawyers — Business Edition and Corporate Counsel Edition, Thomson Reuters, 2009
  • Leaders in Their Field, Chambers USA, 2010-2012
  • Super Lawyers, Thomson Reuters, 2006-2016
  • Top Lawyers, H Texas, 2009-2011, 2014-2016
  • 2013 Top Rated Lawyer for Energy, Environmental and Natural Resources by American Lawyer Media and Martindale-Hubbell


  • Texas
  • United States District Courts for the Eastern, Northern, Southern and Western Districts of Texas
  • United States Supreme Court

  • American Bar Association, Environment, Energy and Resources Section and Environmental Transactions and Brownfields Committee
  • Houston Bar Association, Environmental Section (Past Chair)
  • Houston Society for the Prevention of Cruelty to Animals (Board of Directors)
  • Spondylitis Association of America (Volunteer)
  • State Bar of Texas, Environmental and Natural Resources Section (Past Chair; Current Pro-Bono Committee Chair)
  • Texas Board of Legal Specialization, Business Bankruptcy
  • University of St. Thomas — Center for Irish Studies (Board Member)
  • Women’s Energy Network, Houston Chapter


April 2014
Environmental Liabilities and the Chapter 7 Trustee

The Journal of the National Association of Bankruptcy Trustees 


February 2017
All Good Things Must End: Decommissioning Oil and Gas Facilities Institute for Energy Law 68th Annual Oil & Gas Law Conference
All Good Things Must End: Decommissioning Oil and Gas Facilities Institute for Energy Law 68th Annual Oil & Gas Law Conference