Dianne K. Conway, Partner, Board of Directors
  • Born in Walnut Creek, California, Dianne K. Conway grew up in Mt. Kisco, New York and completed high school in Bellevue, Washington. She then went on to receive a B.A. in Near Eastern Languages and Civilization at the University of Washington, an M.A. in Arab Studies from Georgetown University, and a J.D. at the University of Virginia School of Law. In between, she also worked in Washington, D.C. and lived in Syria and Israel before landing in Tacoma and joining GTH, where she seems to have finally settled down.

    Dianne’s practice areas include environmental law, real estate litigation, natural resources law, and land use. Her commitment to these issues also extends to her life outside work. She has co-authored articles about environmental issues and litigation, and she served as a member and officer of the Board of Trustees of the AgForestry Education Foundation from 2007 to 2012. Dianne also served on the Point Defiance Zoo Society’s Board of Directors for 11 years, including as President, and was chair of the 2013 Zoobilee. Currently, she serves as President of the fabulous Symphony Tacoma.

    Dianne lives with two lively and intelligent border collies, and she sometimes considers acquiring a small herd of sheep – or fulltime Frisbee thrower – to keep them occupied while she’s working. Dianne’s other interests include travel both near and far, exploring the outdoors, and enjoying great food and wine with friends.

  • Education

    • J.D., University of Virginia School of Law, 1998
    • M.A., Arab Studies, Georgetown University, 1991
    • B.A., Near Eastern Languages and Civilization, University of Washington, 1988

    Jurisdictions Admitted to Practice

    • Washington State Courts
    • U.S. District Court, Western District of Washington
    • United States Court of Appeals, Ninth Circuit
    • United States Supreme Court

    Professional & Bar Association Memberships

    • Washington Agriculture-Forestry Leadership Program, Class 26

    • American Bar Association

      • Member, Environment, Energy and Resources Section
    • Washington State Bar Association

      • Member, Environmental and Land Use Law Section
    • Tacoma-Pierce County Bar Association

    • Washington Women Lawyers, Pierce County Chapter

      • Co-President (2006)
      • Chair, Auction Committee (2003, 2005 & 2007)
      • Co-Chair, Auction Committee (2004)
      • Co-Vice President, Special Events (2001-2002)

    Professional History

    • Member, GTH Board of Directors, 2017 - present.

    Community Activities

    • Symphony Tacoma, Board of Directors (2014-present); President (2019-present); First Vice President (2017-2019); Second Vice President (2016-2017); Gala Chair (2017-2018)

    • Point Defiance Zoo Society, Board of Directors (2003-2014); Secretary (2008-2009); Vice President (2009-2010); President (2010-2011); Immediate Past President (2011-2012)

    • Point Defiance Zoo Society, Zoobilee Chair (2013)

    • Appointed by Mayor to Citizen Commission on Elected Salaries (Tacoma) (2015-2018)

    • Washington Agriculture-Forestry Education Foundation, Board of Trustees (2007-2012); Second Vice Chair (2009-2010); First Vice Chair (2010-2012)

    • KBTC Association, Board of Directors (2007-2010)

    • Tacoma Pierce County Chamber of Commerce Leadership Program (1999) 

    • Ran/limped/crawled two marathons for the Leukemia & Lymphoma Society’s Team in Training Program

  • Representative Matters


    • Successfully defended Cruise Terminals of America against citizen suit claiming it was required to obtain coverage under the Industrial Stormwater General Permit.

    • Defended SSA Containers in Clean Water Act citizen suit seeking millions of dollars in relief for alleged violations of Industrial Stormwater General Permit.

    • Successfully defended petroleum-delivery company against $1.5 million MTCA arranger-liability and transporter-liability claim.

    • Co-counsel for Energy Northwest in successful defense against third-party attack on the re-issuance of its NPDES permit.

    • Co-counsel for Dow Chemical Company in successful defense against third-party MTCA-liability claim.

    • Co-counsel for City of Seattle in matters relating to the allocation of tens of millions of dollars in contaminated sediment cleanup around Gas Works Park.

    • Represented the purchaser of an operating RCRA facility in multi-million dollar transaction.

    • Defended client in challenge to penalty arising from the accidental spill of petroleum products and obtained a significantly reduced penalty.

    • Regularly represent clients in broad array of Model Toxics Control Act, Clean Water Act, and other environmental matters.


    • Regularly represents property owners in a broad variety of real estate and land use disputes, including easement disputes, property line disagreements, timber trespass claims, tidelands disputes, and claims relating to the violation of restrictive covenants.

    • Represent numerous homeowners associations in a broad variety of matters, including enforcement of restrictive covenants and preparation and review of Bylaws and other governing documents.

    • Co-counsel in pro bono matter for two families defrauded by a landlord who had been engaged in a long-term systematic practice of keeping deposits of potential tenants but not renting to them. Both families lost deposits under $1000. Obtained $105,000 judgment against the landlord as well as an injunction preventing the landlord from engaging in future rental of housing units.

    • OTHER

    • Successfully represented animal-feed manufacturer in product liability/Consumer Protection Act lawsuit brought by ranch owner.

    • Key member of team that successfully defended City of Tacoma against $6 billion damages claim brought by the Skokomish Indian Tribe.

  • Tacoma Arches at the History Museum
  • Pioneer Square
  • Reflection pond by the Tacoma Glass Museum
  • Duwamish Waterway and brown field cleanup
  • Fireboats on the Seattle Waterfront
Gordon Thomas Honeywell LLP


1201 Pacific Ave, #2100
Tacoma, WA 98402

Telephone: 253.620.6500
Fax: 253.620.6565


One Union Square
600 University St, #2100
Seattle, WA 98101

Telephone: 206.676.7500
Fax: 206.676.7575

Visit the Gordon Thomas Honeywell Governmental Affairs Web Site


1201 Pacific Ave, #2100, Tacoma, WA 98402
Telephone: 253.620.6500  Fax: 253.620.6565


One Union Square, 600 University St, #2100, Seattle, WA 98101
Telephone: 206.676.7500  Fax: 206.676.7575