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About me

Greetings: I proudly represent people who have been injured on the job, or who have become ill due to occupational exposures. I do not represent corporations or insurance companies. In addition to my workers' compensation cases, I also help people in coverage disputes with private disability carriers and in appeals from denials of Social Security Disability applications.


Languages spoken: Spanish

Practice areas


  1. Workers Compensation: 85%
  2. Social Security: 10%
  3. Lawsuits & Disputes: 5%



Free consultation (30 minutes)

Attorney endorsements

5 total 

Are you an attorney? Endorse this lawyer

  • Amie Christine Peters

    Katherine is a compassionate advocate. She approaches her clients with respect and compassion, while still being an aggressive advocate for their rights in court. I highly recommend Katherine.


    Amie Peters Workers compensation Attorney
    Relationship: Fellow lawyer in community

  • Roxanne Eberle

    Katherine Mason is smart and committed workers compensation attorney. I refer people to her for workers compensation cases because I do not practice in that area of law and I know that she will take good care of them. She is a quality lawyer with the highest ethics - putting her clients' interests even above her own. You could not do better than have Katherine Mason in your corner.


    Roxanne Eberle Personal injury Attorney
    Relationship: Fellow lawyer in community

Contact info

Law Offices of Katherine L. Mason, PLLC

4711 Aurora Avenue North
Seattle, WA, 98103


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Alvin Anderson AwardWSAJ2016
Rising Star - Workers' CompensationWashington Law & Politics Magazine2011
Rising Star -- Workers' CompensationWashington Law & Politics Magazine2009
Rising Star -- Workers' CompensationWashington Law & Politics Magazine2007
Rising Star -- Workers' CompesnationN/A2006
Rising Star -- Workers' CompensationN/A2005
Work experience
TitleCompany nameDuration
OwnerLaw Offices of Katherine L. Mason2007 - Present
AssociateCausey Law Firm2002 - 2006
AssociateMcIntyre & Barns2000 - 2002
Assistant Attorney GeneralAttorney General of Washington1999 - 2000
Association namePosition nameDuration
Washington State Association for JusticeVP Legislative Committee2015 - Present
Washington State Association for Justice, Executive CommitteeMember2014 - Present
American Association for JusticeMember2005 - Present
King County Bar AssociationMember2003 - Present
Washington State Association for Justice, Workers' Compensation SectionMember2002 - Present
Washington State Trial Lawyers AssociationEagle Member2002 - Present
Washington State Association for JusticeVP Development2014 - 2015
Washington State Association for Justice2nd VP Development2013 - 2014
Washington State Association for JusticeEditor -- Trial News2011 - 2013
Washington State Association for JusticeChair -- Workers' Compensation Section2009 - 2010
WSTLA- Workers' Compensation SectionVice Chair2008 - 2009
Publication nameTitleDate
Trial News (Washington State Trial Lawyers Association)Editor-in-Chief2011
WSAJ Trial NewsAssoicate Editor2010
WSAJ Workers' Compensation DeskbookChapter Written: FAQ's for Workers' Compensation2009
WSTLA Trial NewsIncreased ESD and DLI Data Sharing - A Trap for the Unwary 2006
Kansas Trial Lawyers AssociationTrauma and Multiple Sclerosis: Solid Evidence Trumps Frye Defense on Casual Relationship Issues2003
Workers First Watch Trauma & Multiple Sclerosis ...2003
WSTLA Trial NewsThe Trafficking of Counterfeit Prescription Drugs: The Real Story N/A
School nameMajorDegreeGraduated
Chicago-Kent College of Law Illinois Institute of TechnologyLawJD - Juris Doctor1999
Central Washington UniversityEnglishMasters1995
Central Washington UniversityEnglish & PhilosophyBA - Bachelor of Arts1993
Speaking engagements
Conference nameTitleDate
Spring Conference, Workers' CompensationErgonomics, Adaptive Equipment and Employability2016
Annual ConventionVoir Dire Demonstration2016
What You Didn't Learn in Law SchoolCo-Chair of Business of Law Seminar/CLE2015
Washington State Association for Justice, Workers' Compensation SectionDebunking the Parking Lot Attendant2015
Annual Workers' Comp. CLEVocational Disputes with DLI2010
WSTLA- Workers' Compensation CLEGetting Provisional Time Loss Benefits Paid2008
WSTLA Workers' Comp CLEEthics & Medical Records2007
Medical RecordsMedical Records and Litigation2007
WSTLA Workers' Comp CLEPitfalls Arising Out of the New DLI/Employment Security Computer Link2006
WSTLA Employment Law CLEWhen Unemployment & Workers' Compensation Collide2006
Workers' Compensation Case Preparation TechniquesCase Preparation Strategies and Ethics2006
WSTLA Workers' Comp CLEDiscovery Tools at the Board: Requests for Admissions2004
Advanced Legal Drafting for Washington ParalegalsDrafting Legal Documents and Pleadings2004
Neighborhood Legal Clinics Training 2003-2006Introduction to Workers' Compensation2003
Law Day 2002 - 2007Pre-Law School Preparation and Expectations2002