Justin M. Sedell


Practice Emphasis

Divorce, complex child custody disputes, collaborative law, and high conflict litigation

Justin’s practice concentrates on divorce, complex child custody disputes, collaborative law, and high conflict litigation. Justin is an experienced trial lawyer who represents clients facing a wide range of complicated family law disputes requiring sophisticated legal advice. He has practiced in Superior Courts throughout Western Washington and represents clients in the Washington State Court of Appeals and Supreme Court of Washington.


  • Bachelor of Arts, Political Science, 2002, University of California at Davis
  • J.D., cum laude, 2005, Seattle University School of Law
  • IACP Collaborative Law Training (International Association of Collaborative Professionals)
  • IACP Facilitative Mediation Training (International Association of Collaborative Professionals)

Judicial Clerkships

  • Law Clerk, Judge Mary I. Yu, King County Superior Court, 2005-2006
  • Law Clerk, Judge Steven Gonzalez, King County Superior Court, 2006


  • “Domestic Partnerships: Another Look, Additional Rights,” King County Bar Bulletin (2009)
  • “A Family Law Practitioner’s Guide to Navigating the Domestic Partnership Expansion Bill,” Washington State Bar News, co-authored with Elizabeth Hershman-Greven (2008)
  • “Washington’s Expanded Domestic Partnership Registry Grants Important New Rights for GLBT Couples,” Perspective, co-authored with Elizabeth Hershman-Greven (2008)
  • “Legislature Acts Post-Anderson Domestic Partnership Bill Paves Way,” King County Bar Association Bar Journal, co-authored with Elizabeth Hershman-Greven (May 2007)


  • Speaker, “Family Law 101: What You Need to Know,” Pincus Professional Education (2015)
  • Co-Chair, “WSBA Community Property Seminar,” Washington State Bar Association CLE (2012)
  • Speaker, “Introduction to Collaborative Practice,” CLE for family law attorneys (2011)
  • Speaker, “Parenting Plan Litigation,” King County Bar Association CLE (2010)
  • Speaker, “Impacts of Washington’s Domestic Partnership Laws on the Elder Care Community,” CLE (2008, 2009)
  • Speaker, “Parenting Plans and the Uniform Child Custody Jurisdiction and Enforcement Act,” King County Bar Association CLE (2009)
  • Speaker, “Litigating Cases Involving Unmarried Couples,” Snohomish County Bar Association CLE (2009)
  • Speaker, “Understanding Washington’s Domestic Partnership Legislation,” Tacoma Pierce County Bar Association CLE (2008)
  • Speaker, “Relationship Agreements,” King County Bar Association CLE (2008)
  • Speaker, “Washington State’s Domestic Partner Law,” Washington ACLU Seminar (2007)
  • Speaker, Domestic Partner Law Forum, Equal Rights Washington Public Event, Tacoma, WA (2007)

Professional & Civic

Washington State Bar Association

Adjunct Law Professor, Seattle University School of Law, 2007 – present

Named Best Lawyers®  2023 “Lawyer of the Year” in Seattle in “Family Law”

Recognized by The Best Lawyers in America® in the practice area of ‘Family Law’  (2019 – 2024 ed.)

Recognized as part of the 2024 Lawdragon 500 Leading U.S. Family Lawyers

Washington Law & Politics magazine “Super Lawyer,” 2022, 2023

Named a ‘Rising Star’ by Washington Law & Politics and Washington Super Lawyers magazines, Family Law, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, and 2020

Member and prior Co-Chair, Judicial Evaluation Committee, QLaw Bar Association of Washington

Member of King County Superior Court Unified Family Court Committee

Prior Member, Alternative Dispute Resolution Committee, Washington State Bar Association

Member, QLaw Bar Association

Member, Washington State Bar Association, Family Law Section

Member, International Association of Collaborative Professionals

Member, Collaborative Professionals of Washington

Member, King County Collaborative Law

Justin M. Sedell

Practice Areas


This guy is INCREDIBLE! Our family was truly taken care of in our time of need! My divorce was a mess from previous lawyers…Justin came in and worked out everything for us. His attention to detail and his education in law is superb. He doesn’t miss a thing, and he truly fights for who he is representing. One phrase, I’ll never forget, “Sometimes you got to stick to your guns.” This man is for Real, and He does things Right! Big Thank you to superwoman Shelley Alexander, legal aid for Justin. All I can say, is What a Team!!
Janelle - via AVVO
At the most difficult time in my life Justin took over all my legal issues - we sat down day one and listed out the desired outcome - he exceeded every point. I highly recommend Justin for your Divorce and Parenting Plan needs - his experience and focus keeping an eye on me and what was best for the divorce and also keeping an eye out for my children and keeping their best interest at heart while balancing my emotions and what was best long term. You will not find a better lawyer than Justin Sedell.
Kevin - via AVVO
Justin was recommended to me by another attorney due to my case relocating to another county. Justin jumped right in and became a very strong advocate for me from the very beginning. He teamed together with a second attorney with the firm due to the complexity and volume of my case matters. The two worked together to come up with logical and ethical strategies that didn't always work out in my favor, but I appreciated them and felt good about what I was doing for everybody involved. My case was very contentious and far from ordinary. Justin encouraged me to take the high road every step of the way. I can look back at what I've done in court and know that I have nothing to be ashamed of. Unlike my ex, my legal team steered me away from abusing the legal system, and my ex throughout my several year divorce. Justin's strategy and work was strong and he did a great job. After relocating before my divorce was over, I needed to hire a new attorney to finish my case. Justin was nice enough to keep in touch to get updates on my case through the end. I'd hire him again and have recommended him to friends.
Anonymous - via AVVO