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About me

 “I was only 18 when my son Lucas was born and didn’t realize his slow development was due to an injury during birth. When I met Judy Massong, I was young, naïve, and destitute. She was compassionate, cared a lot about Lucas, and alleviated my fears about going to trial. Her knowledge of medical terminology was incredibly helpful and contributed to the verdict against the hospital. I am still caring for my son, who requires 24-hour care, and this would not have been possible without Judy’s representation. She is awesome.”

~Cheryl M.
Auburn, WA

“My daughter Dakota was injured during birth when a catheter punctured my womb. She suffered from a loss of blood, and several other mistakes were made before she was finally resuscitated. My mother, who is a nurse, suggested Judy Massong. With her as my attorney, I felt I was in the most experienced hands. With Judy's help, we settled twice, once with the hospital and again with the medical device manufacturer. Judy is as strong as a bulldog, and she always made it her goal keep us informed and help us find the resolution we needed as a family.

~Julie L.
Bothell, WA



Languages spoken: French

Practice areas


  1. Unspecified: 20%
  2. Personal Injury: 20%
  3. Defective Products: 20%
  4. Medical Malpractice: 20%
  5. Wrongful Death: 20%

Attorney endorsements

5 total 

Are you an attorney? Endorse this lawyer

  • Susan Jayne Shulenberger

    I endorse this lawyer.


    Susan Shulenberger Divorce and separation Attorney
    Relationship: Fellow lawyer in community

  • Karen J Scudder

    Judy is the kind of lawyer that other lawyers go to with questions. As a nurse, she adds something to medical negligence cases that other lawyers can't. She is a force to be reckoned with in the legal community. She is also passionate about what she does and great with her clients. I would recommend her to my own friends and family.


    Karen Scudder Personal injury Attorney
    Relationship: Fellow lawyer in community

Contact info

Diamond ~ Massong, PLLC

1411 Fourth Ave. #765
Seattle, WA, 98121


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Top 50 Women, Washington Super Lawyers 2012Superlawyers.com2012
Washington Super Lawyers 2012Superlawyers.com2012
2011-2012 Best Law FirmsU.S. News Group, Best Lawyers2011
AV Preeminent 5.0Martindale-Hubbell Peer Review Rating2011
Work experience
TitleCompany nameDuration
PartnerDiamond~Massong, PLLC2010 - Present
Association namePosition nameDuration
Washington State Bar AssociationBoard of Governors2010 - Present
King County Bar AssociationJudicial Evaluation Committee2010 - Present
Association of Trial Lawyers of AmericaDelegate to the Board of Governors2004 - Present
Washington State Trial Lawyers AssociationPresident2003 - 2004
School nameMajorDegreeGraduated
Golden Gate University School of LawLawJD - Juris Doctor1980
University of CaliforniaNursingMS - Master of Science1974
University of WashingtonNursingBS - Bachelor of Science1973