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About me

My practice focuses on helping clients reach agreements.


Instead of engaging in a court battle in an attempt to somehow create a "winner" at the expense of another, I work with my clients in a respecful and transparent manner to forge mutually acceptable outcomes that take into account everyone's needs and concerns. I do so using two effective processes: (1) Collaborative Divorce, and (2) Divorce Mediation.


When working in a Collaborative Divorce process, I work as an attorney for a client who engages me solely to help reach an agreement.


When working in the mediation process, I work as an impartial mediator to help both parties through dialogue reach agreements.


For more information, call or visit my website.


Practice areas


  1. Family: 34%
  2. Divorce: 34%
  3. Mediation: 32%


Payment types:

Cash, Check, Credit card

Attorney endorsements

13 total 

Are you an attorney? Endorse this lawyer

  • Alexis Squier

    Mark Weiss is an esteemed leader in Collaborative Law, locally and internationally. He brings the breadth and depth of his knowledge to his clients’ cases. I have worked with Mark as a team member in a number of Collaborative cases and have found his wisdom and insight to generate trust on both sides of the table. He is a thoughtful listener, who reassures clients experiencing the overwhelming anxieties that can come with divorce. He balances well the emotional and legal timing needs of divorce cases. Mark is also a highly respected mediator who steadfastly maintains his unbiased role as he guides his clients to well-considered, comprehensive and durable agreements. It is my great pleasure to endorse Mark Weiss.


    Alexis Squier Family Attorney
    Relationship: Worked together on matter

  • Susan Millican O'Brian

    Mark and I had a case together years ago, but I know him to be an incredible collaborative law attorney, and I highly recommend him.


    Susan O'Brian Divorce and separation Attorney
    Relationship: Opposing Counsel on matter

Contact info

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

100 W. Harrison St.
South Tower, Ste. 470
Seattle, WA, 98119-4116


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Super LawyerWashington Super Lawyers2013
AV RatedMartindale-Hubbell2013
Super LawyerWashington Super Lawyers2012
Super LawyerWashington Super Lawyers2011
Super LawyerWashington Super Lawyers2010
Super LawyerWashington Super Lawyers2009
Super LawyerWashington Super Lawyers2008
Super LawyerWashington Super Lawyers2007
Family Law Attorney of the YearWashington State Bar Association, Family Law Section2005
Work experience
TitleCompany nameDuration
DirectorInternational Academy of Collaborative Professionals2012 - Present
PrincipalLaw Office Of J. Mark Weiss, PS1997 - Present
President, Washington chapterAmerican Academy of Matrimonial Lawyers2010 - 2011
DirectorKing County Collaborative Law2007 - 2012
TrusteeKing County Bar Association2006 - 2008
PartnerLee & Weiss1995 - 1997
PartnerWeiss & Hemmat1991 - 1995
AttorneySole Practitioner1990 - 1991
AssociateFerguson & Burdell1987 - 1990
Association namePosition nameDuration
King County Bar AssociationMemberN/A
Washington State Bar AssociationMemberN/A
Washington State Bar Association, Family Law SectionMemberN/A
International Academy of Collaborative ProfessionalsMemberN/A
Collaborative Professionals of WashingtonMemberN/A
Seattle Collaborative Family LawMemberN/A
King County Collaborative LawBoard MemberN/A
King County Collaborative LawSecretaryN/A
American Academy of Matrimonial Lawyers, Collaborative Law CommitteeMemberN/A
Publication nameTitleDate
Collaborative Review (International Academy of Collaborative Professionals)Client Preparation: An Essential Ingredient for Successful Collaboration2013
Aspatore Books/Thomson ReutersInside the Minds: Developing a Collaborative Family Law Practice2011
King County Bar BulletinOffering Families a Better Divorce2009
King County Bar BulletinCollaborative Law: Questions and Answers2008
Wash. St. Bar Assn. Family Law DeskbookFamily Law Court Records2006
Gonzaga Law ReviewCommunity Property Interests in Separate Property Businesses2005
School nameMajorDegreeGraduated
University of WashingtonN/ABA - Bachelor of ArtsN/A
Lewis & Clark Law SchoolLawJD - Juris DoctorN/A
Speaking engagements
Conference nameTitleDate
Two-Day Collaborative Practice TrainingCollaborative Practice Training2013
IACP Institute, PhoenixA Collaborative Case from Start to Finish2013
IACP Forum, San AntonioGuiding Clients to their Agreement, Pre-Forum Institute2013
IACP Forum, San AntonioBrainstorming Myths and Creativity advanced workshop2013
Day-long trainingFacilitative Negotiation Workshop for Collaborative Professionals and Mediators2013
CPW ConferenceImpact of the UCLA on the Future of Your Collaborative Practice2013
AAML Spring Seminar/WashingtonTop Ten Negotiating Tips Every Lawyer Can Borrow from Collaborative Law2013