150 N. Michigan Ave. Ste. 1420
Chicago, IL 60601

J. Mark Weiss

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Law Office of J. Mark Weiss, P.S.

Contact Information

100 W. Harrison St., South Tower, Ste. 470
Seattle WA 98119-4116
Work (206) 622-6707

Practice State



Mark helps his clients reach agreements without resorting to court intervention. Mark works primarily as a mediator (and a Certified Divorce Financial Analyst), and as a lawyer in the Collaborative Divorce process. Mark has extensive training in dispute resolution, and is very experienced assisting clients reach mutually acceptable agreements while staying out of a destructive win-lose dynamic. Mark is rated among the “Top 25” Family Law attorneys in the State of Washington by Washington Law & Politics Magazine, and recognized as a leader in Washington for his expertise in substantive divorce law, in addition to Collaborative Divorce, divorce settlement negotiation, and mediation.


Mediation, Collaborative Law, and Consultation


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  • King, Washington
  • Pierce, Washington
  • Snohomish, Washington


1987 - Juris Doctor, Northwestern School of Law at Lewis & Clark College, Portland, Oregon 2017 - Certified Divorce Financial Analyst

Legal Organizations

Member of King County Bar Association, Washington State Bar Association, AAML, International Academy of Collaborative Professionals, Academy of Professional Family Mediators, Mediators Beyond Borders, Collaborative Professionals of Washington, King County Collaborative Law, Seattle Collaborative Law, Institute of Divorce Financial Analysts. Positions held: King County Bar Association, Trustee, 2005-2008; King County Collaborative Law, Director, 2007-present; King County Collaborative Law Secretary, 2008-2009; Washington State Bar Association, Family Law Section Chair, Executive Committee, 1997-2005; International Academy of Collaborative Professionals, 2005-Present


"Ken Weber Attorney of the Year Award", Washington State Bar Association, Family Law Section, 2005; "Super Lawyer", Washington Law & Politics, annually since 2007; Basic and advanced mediation and Collaborative Law training.

CLE Presentations

Frequent presenter on family law issues, and Collaborative Law Trainer. See Mark's website for details.


"Family Law Court Records", "Family Law Deskbook," Washington State Bar Association; "Community Property Interests in Separate Property Business," 40 Gonzaga L. Rev. 205 - 2005; Co-author, "Lawrence and Nunn Reject the 'Friendly Parent Concept", Domestic Violence Report, 2001; Contributing Editor, Washington Practice Family and Community Property Law; "Collaborative Law: Questions and Answers," King County Bar Bulletin (2008).

AAML National

Member, Collaborative Law Committee

AAML Chapter

President, 2010-2011.

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